Blank white screen on Invoiceplane - migrate on other server and domain - please for help!

Dear,

I migrate my InvoicePlane from one to other hosting and domen, import database, change database in database.php, All working but when I click to domen screen blank. I change in .httacces file folder test.

Please help me.

This is my error code

<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed'); ?>

DEBUG - 2016-02-22 10:59:38 --> Config Class Initialized
DEBUG - 2016-02-22 10:59:38 --> Hooks Class Initialized
DEBUG - 2016-02-22 10:59:38 --> MY Utf8 Initialized - Hack for PHPUnit to run
DEBUG - 2016-02-22 10:59:38 --> UTF-8 Support Enabled
DEBUG - 2016-02-22 10:59:38 --> URI Class Initialized
DEBUG - 2016-02-22 10:59:38 --> Router Class Initialized
DEBUG - 2016-02-22 10:59:38 --> No URI present. Default controller set.
DEBUG - 2016-02-22 10:59:38 --> Output Class Initialized
DEBUG - 2016-02-22 10:59:38 --> Security Class Initialized
DEBUG - 2016-02-22 10:59:38 --> Input Class Initialized
DEBUG - 2016-02-22 10:59:38 --> XSS Filtering completed
DEBUG - 2016-02-22 10:59:38 --> Global POST and COOKIE data sanitized
DEBUG - 2016-02-22 10:59:38 --> Language Class Initialized
DEBUG - 2016-02-22 10:59:38 --> Language Class Initialized
DEBUG - 2016-02-22 10:59:38 --> Config Class Initialized
DEBUG - 2016-02-22 10:59:38 --> Loader Class Initialized
DEBUG - 2016-02-22 10:59:38 --> Controller Class Initialized
DEBUG - 2016-02-22 10:59:38 --> Dashboard MX_Controller Initialized
DEBUG - 2016-02-22 10:59:38 --> Config file loaded: application/config/invoice_plane.php
DEBUG - 2016-02-22 10:59:38 --> Session Class Initialized
DEBUG - 2016-02-22 10:59:38 --> Helper loaded: string_helper
DEBUG - 2016-02-22 10:59:38 --> Session routines successfully run
DEBUG - 2016-02-22 10:59:38 --> Helper loaded: url_helper
DEBUG - 2016-02-22 10:59:38 --> Database Driver Class Initialized
DEBUG - 2016-02-22 10:59:38 --> Helper loaded: form_helper
DEBUG - 2016-02-22 10:59:38 --> Form Validation Class Initialized
DEBUG - 2016-02-22 10:59:38 --> Helper loaded: number_helper
DEBUG - 2016-02-22 10:59:38 --> Helper loaded: pager_helper
DEBUG - 2016-02-22 10:59:38 --> Helper loaded: invoice_helper
DEBUG - 2016-02-22 10:59:38 --> Helper loaded: date_helper
DEBUG - 2016-02-22 10:59:38 --> Helper loaded: redirect_helper
DEBUG - 2016-02-22 10:59:38 --> Model Class Initialized
DEBUG - 2016-02-22 10:59:38 --> File loaded: application/modules/settings/models/mdl_settings.php
DEBUG - 2016-02-22 10:59:38 --> Model Class Initialized
DEBUG - 2016-02-22 10:59:38 --> Language file loaded: language/Serbian (Latin)/ip_lang.php
DEBUG - 2016-02-22 10:59:38 --> Language file loaded: language/Serbian (Latin)/form_validation_lang.php
DEBUG - 2016-02-22 10:59:38 --> Language file loaded: language/Serbian (Latin)/custom_lang.php
DEBUG - 2016-02-22 10:59:38 --> Helper loaded: language_helper
DEBUG - 2016-02-22 10:59:38 --> File loaded: application/controllers/../modules/layout/controllers/layout.php
DEBUG - 2016-02-22 10:59:38 --> Layout MX_Controller Initialized
ERROR - 2016-02-22 10:59:38 --> Severity: Warning  --> Cannot modify header information - headers already sent by (output started at /home/cituljei/public_html/test/application/language/Serbian (Latin)/ip_lang.php:1) /home/cituljei/public_html/test/system/helpers/url_helper.php 543
DEBUG - 2016-02-22 10:59:39 --> Config Class Initialized
DEBUG - 2016-02-22 10:59:39 --> Hooks Class Initialized
DEBUG - 2016-02-22 10:59:39 --> MY Utf8 Initialized - Hack for PHPUnit to run
DEBUG - 2016-02-22 10:59:39 --> UTF-8 Support Enabled
DEBUG - 2016-02-22 10:59:39 --> URI Class Initialized
DEBUG - 2016-02-22 10:59:39 --> Router Class Initialized
DEBUG - 2016-02-22 10:59:39 --> No URI present. Default controller set.
DEBUG - 2016-02-22 10:59:39 --> Output Class Initialized
DEBUG - 2016-02-22 10:59:39 --> Security Class Initialized
DEBUG - 2016-02-22 10:59:39 --> Input Class Initialized
DEBUG - 2016-02-22 10:59:39 --> XSS Filtering completed
DEBUG - 2016-02-22 10:59:39 --> Global POST and COOKIE data sanitized
DEBUG - 2016-02-22 10:59:39 --> Language Class Initialized
DEBUG - 2016-02-22 10:59:39 --> Language Class Initialized
DEBUG - 2016-02-22 10:59:39 --> Config Class Initialized
DEBUG - 2016-02-22 10:59:39 --> Loader Class Initialized
DEBUG - 2016-02-22 10:59:39 --> Controller Class Initialized
DEBUG - 2016-02-22 10:59:39 --> Dashboard MX_Controller Initialized
DEBUG - 2016-02-22 10:59:39 --> Config file loaded: application/config/invoice_plane.php
DEBUG - 2016-02-22 10:59:39 --> Session Class Initialized
DEBUG - 2016-02-22 10:59:39 --> Helper loaded: string_helper
DEBUG - 2016-02-22 10:59:39 --> Session routines successfully run
DEBUG - 2016-02-22 10:59:39 --> Helper loaded: url_helper
DEBUG - 2016-02-22 10:59:39 --> Database Driver Class Initialized
DEBUG - 2016-02-22 10:59:39 --> Helper loaded: form_helper
DEBUG - 2016-02-22 10:59:39 --> Form Validation Class Initialized
DEBUG - 2016-02-22 10:59:39 --> Helper loaded: number_helper
DEBUG - 2016-02-22 10:59:39 --> Helper loaded: pager_helper
DEBUG - 2016-02-22 10:59:39 --> Helper loaded: invoice_helper
DEBUG - 2016-02-22 10:59:39 --> Helper loaded: date_helper
DEBUG - 2016-02-22 10:59:39 --> Helper loaded: redirect_helper
DEBUG - 2016-02-22 10:59:39 --> Model Class Initialized
DEBUG - 2016-02-22 10:59:39 --> File loaded: application/modules/settings/models/mdl_settings.php
DEBUG - 2016-02-22 10:59:39 --> Model Class Initialized
DEBUG - 2016-02-22 10:59:39 --> Language file loaded: language/Serbian (Latin)/ip_lang.php
DEBUG - 2016-02-22 10:59:39 --> Language file loaded: language/Serbian (Latin)/form_validation_lang.php
DEBUG - 2016-02-22 10:59:39 --> Language file loaded: language/Serbian (Latin)/custom_lang.php
DEBUG - 2016-02-22 10:59:39 --> Helper loaded: language_helper
DEBUG - 2016-02-22 10:59:39 --> File loaded: application/controllers/../modules/layout/controllers/layout.php
DEBUG - 2016-02-22 10:59:39 --> Layout MX_Controller Initialized
ERROR - 2016-02-22 10:59:39 --> Severity: Warning  --> Cannot modify header information - headers already sent by (output started at /home/cituljei/public_html/test/application/language/Serbian (Latin)/ip_lang.php:1) /home/cituljei/public_html/test/system/helpers/url_helper.php 543
DEBUG - 2016-02-22 10:59:40 --> Config Class Initialized
DEBUG - 2016-02-22 10:59:40 --> Hooks Class Initialized
DEBUG - 2016-02-22 10:59:40 --> MY Utf8 Initialized - Hack for PHPUnit to run
DEBUG - 2016-02-22 10:59:40 --> UTF-8 Support Enabled
DEBUG - 2016-02-22 10:59:40 --> URI Class Initialized
DEBUG - 2016-02-22 10:59:40 --> Router Class Initialized
DEBUG - 2016-02-22 10:59:40 --> No URI present. Default controller set.
DEBUG - 2016-02-22 10:59:40 --> Output Class Initialized
DEBUG - 2016-02-22 10:59:40 --> Security Class Initialized
DEBUG - 2016-02-22 10:59:40 --> Input Class Initialized
DEBUG - 2016-02-22 10:59:40 --> XSS Filtering completed
DEBUG - 2016-02-22 10:59:40 --> Global POST and COOKIE data sanitized
DEBUG - 2016-02-22 10:59:40 --> Language Class Initialized
DEBUG - 2016-02-22 10:59:40 --> Language Class Initialized
DEBUG - 2016-02-22 10:59:40 --> Config Class Initialized
DEBUG - 2016-02-22 10:59:40 --> Loader Class Initialized
DEBUG - 2016-02-22 10:59:40 --> Controller Class Initialized
DEBUG - 2016-02-22 10:59:40 --> Dashboard MX_Controller Initialized
DEBUG - 2016-02-22 10:59:40 --> Config file loaded: application/config/invoice_plane.php
DEBUG - 2016-02-22 10:59:40 --> Session Class Initialized
DEBUG - 2016-02-22 10:59:40 --> Helper loaded: string_helper
DEBUG - 2016-02-22 10:59:40 --> Session routines successfully run
DEBUG - 2016-02-22 10:59:40 --> Helper loaded: url_helper
DEBUG - 2016-02-22 10:59:40 --> Database Driver Class Initialized
DEBUG - 2016-02-22 10:59:40 --> Helper loaded: form_helper
DEBUG - 2016-02-22 10:59:40 --> Form Validation Class Initialized
DEBUG - 2016-02-22 10:59:40 --> Helper loaded: number_helper
DEBUG - 2016-02-22 10:59:40 --> Helper loaded: pager_helper
DEBUG - 2016-02-22 10:59:40 --> Helper loaded: invoice_helper
DEBUG - 2016-02-22 10:59:40 --> Helper loaded: date_helper
DEBUG - 2016-02-22 10:59:40 --> Helper loaded: redirect_helper
DEBUG - 2016-02-22 10:59:40 --> Model Class Initialized
DEBUG - 2016-02-22 10:59:40 --> File loaded: application/modules/settings/models/mdl_settings.php
DEBUG - 2016-02-22 10:59:40 --> Model Class Initialized
DEBUG - 2016-02-22 10:59:40 --> Language file loaded: language/Serbian (Latin)/ip_lang.php
DEBUG - 2016-02-22 10:59:40 --> Language file loaded: language/Serbian (Latin)/form_validation_lang.php
DEBUG - 2016-02-22 10:59:40 --> Language file loaded: language/Serbian (Latin)/custom_lang.php
DEBUG - 2016-02-22 10:59:40 --> Helper loaded: language_helper
DEBUG - 2016-02-22 10:59:40 --> File loaded: application/controllers/../modules/layout/controllers/layout.php
DEBUG - 2016-02-22 10:59:40 --> Layout MX_Controller Initialized
ERROR - 2016-02-22 10:59:40 --> Severity: Warning  --> Cannot modify header information - headers already sent by (output started at /home/cituljei/public_html/test/application/language/Serbian (Latin)/ip_lang.php:1) /home/cituljei/public_html/test/system/helpers/url_helper.php 543
DEBUG - 2016-02-22 10:59:41 --> Config Class Initialized
DEBUG - 2016-02-22 10:59:41 --> Hooks Class Initialized
DEBUG - 2016-02-22 10:59:41 --> MY Utf8 Initialized - Hack for PHPUnit to run
DEBUG - 2016-02-22 10:59:41 --> UTF-8 Support Enabled
DEBUG - 2016-02-22 10:59:41 --> URI Class Initialized
DEBUG - 2016-02-22 10:59:41 --> Router Class Initialized
DEBUG - 2016-02-22 10:59:41 --> No URI present. Default controller set.
DEBUG - 2016-02-22 10:59:41 --> Output Class Initialized
DEBUG - 2016-02-22 10:59:41 --> Security Class Initialized
DEBUG - 2016-02-22 10:59:41 --> Input Class Initialized
DEBUG - 2016-02-22 10:59:41 --> XSS Filtering completed
DEBUG - 2016-02-22 10:59:41 --> Global POST and COOKIE data sanitized
DEBUG - 2016-02-22 10:59:41 --> Language Class Initialized
DEBUG - 2016-02-22 10:59:41 --> Language Class Initialized
DEBUG - 2016-02-22 10:59:41 --> Config Class Initialized
DEBUG - 2016-02-22 10:59:41 --> Loader Class Initialized
DEBUG - 2016-02-22 10:59:41 --> Controller Class Initialized
DEBUG - 2016-02-22 10:59:41 --> Dashboard MX_Controller Initialized
DEBUG - 2016-02-22 10:59:41 --> Config file loaded: application/config/invoice_plane.php
DEBUG - 2016-02-22 10:59:41 --> Session Class Initialized
DEBUG - 2016-02-22 10:59:41 --> Helper loaded: string_helper
DEBUG - 2016-02-22 10:59:41 --> Session routines successfully run
DEBUG - 2016-02-22 10:59:41 --> Helper loaded: url_helper
DEBUG - 2016-02-22 10:59:41 --> Database Driver Class Initialized
DEBUG - 2016-02-22 10:59:41 --> Helper loaded: form_helper
DEBUG - 2016-02-22 10:59:41 --> Form Validation Class Initialized
DEBUG - 2016-02-22 10:59:41 --> Helper loaded: number_helper
DEBUG - 2016-02-22 10:59:41 --> Helper loaded: pager_helper
DEBUG - 2016-02-22 10:59:41 --> Helper loaded: invoice_helper
DEBUG - 2016-02-22 10:59:41 --> Helper loaded: date_helper
DEBUG - 2016-02-22 10:59:41 --> Helper loaded: redirect_helper
DEBUG - 2016-02-22 10:59:41 --> Model Class Initialized
DEBUG - 2016-02-22 10:59:41 --> File loaded: application/modules/settings/models/mdl_settings.php
DEBUG - 2016-02-22 10:59:41 --> Model Class Initialized
DEBUG - 2016-02-22 10:59:41 --> Language file loaded: language/Serbian (Latin)/ip_lang.php
DEBUG - 2016-02-22 10:59:41 --> Language file loaded: language/Serbian (Latin)/form_validation_lang.php
DEBUG - 2016-02-22 10:59:41 --> Language file loaded: language/Serbian (Latin)/custom_lang.php
DEBUG - 2016-02-22 10:59:41 --> Helper loaded: language_helper
DEBUG - 2016-02-22 10:59:41 --> File loaded: application/controllers/../modules/layout/controllers/layout.php
DEBUG - 2016-02-22 10:59:41 --> Layout MX_Controller Initialized
ERROR - 2016-02-22 10:59:41 --> Severity: Warning  --> Cannot modify header information - headers already sent by (output started at /home/cituljei/public_html/test/application/language/Serbian (Latin)/ip_lang.php:1) /home/cituljei/public_html/test/system/helpers/url_helper.php 543
DEBUG - 2016-02-22 10:59:41 --> Config Class Initialized
DEBUG - 2016-02-22 10:59:41 --> Hooks Class Initialized
DEBUG - 2016-02-22 10:59:41 --> MY Utf8 Initialized - Hack for PHPUnit to run
DEBUG - 2016-02-22 10:59:41 --> UTF-8 Support Enabled
DEBUG - 2016-02-22 10:59:41 --> URI Class Initialized
DEBUG - 2016-02-22 10:59:41 --> Router Class Initialized
DEBUG - 2016-02-22 10:59:41 --> No URI present. Default controller set.
DEBUG - 2016-02-22 10:59:41 --> Output Class Initialized
DEBUG - 2016-02-22 10:59:41 --> Security Class Initialized
DEBUG - 2016-02-22 10:59:41 --> Input Class Initialized
DEBUG - 2016-02-22 10:59:41 --> XSS Filtering completed
DEBUG - 2016-02-22 10:59:41 --> Global POST and COOKIE data sanitized
DEBUG - 2016-02-22 10:59:41 --> Language Class Initialized
DEBUG - 2016-02-22 10:59:41 --> Language Class Initialized
DEBUG - 2016-02-22 10:59:41 --> Config Class Initialized
DEBUG - 2016-02-22 10:59:41 --> Loader Class Initialized
DEBUG - 2016-02-22 10:59:41 --> Controller Class Initialized
DEBUG - 2016-02-22 10:59:41 --> Dashboard MX_Controller Initialized
DEBUG - 2016-02-22 10:59:41 --> Config file loaded: application/config/invoice_plane.php
DEBUG - 2016-02-22 10:59:41 --> Session Class Initialized
DEBUG - 2016-02-22 10:59:41 --> Helper loaded: string_helper
DEBUG - 2016-02-22 10:59:41 --> Session routines successfully run
DEBUG - 2016-02-22 10:59:41 --> Helper loaded: url_helper
DEBUG - 2016-02-22 10:59:41 --> Database Driver Class Initialized
DEBUG - 2016-02-22 10:59:41 --> Helper loaded: form_helper
DEBUG - 2016-02-22 10:59:41 --> Form Validation Class Initialized
DEBUG - 2016-02-22 10:59:41 --> Helper loaded: number_helper
DEBUG - 2016-02-22 10:59:41 --> Helper loaded: pager_helper
DEBUG - 2016-02-22 10:59:41 --> Helper loaded: invoice_helper
DEBUG - 2016-02-22 10:59:41 --> Helper loaded: date_helper
DEBUG - 2016-02-22 10:59:41 --> Helper loaded: redirect_helper
DEBUG - 2016-02-22 10:59:41 --> Model Class Initialized
DEBUG - 2016-02-22 10:59:41 --> File loaded: application/modules/settings/models/mdl_settings.php
DEBUG - 2016-02-22 10:59:41 --> Model Class Initialized
DEBUG - 2016-02-22 10:59:41 --> Language file loaded: language/Serbian (Latin)/ip_lang.php
DEBUG - 2016-02-22 10:59:41 --> Language file loaded: language/Serbian (Latin)/form_validation_lang.php
DEBUG - 2016-02-22 10:59:41 --> Language file loaded: language/Serbian (Latin)/custom_lang.php
DEBUG - 2016-02-22 10:59:41 --> Helper loaded: language_helper
DEBUG - 2016-02-22 10:59:41 --> File loaded: application/controllers/../modules/layout/controllers/layout.php
DEBUG - 2016-02-22 10:59:41 --> Layout MX_Controller Initialized
ERROR - 2016-02-22 10:59:41 --> Severity: Warning  --> Cannot modify header information - headers already sent by (output started at /home/cituljei/public_html/test/application/language/Serbian (Latin)/ip_lang.php:1) /home/cituljei/public_html/test/system/helpers/url_helper.php 543
DEBUG - 2016-02-22 10:59:42 --> Config Class Initialized
DEBUG - 2016-02-22 10:59:42 --> Hooks Class Initialized
DEBUG - 2016-02-22 10:59:42 --> MY Utf8 Initialized - Hack for PHPUnit to run
DEBUG - 2016-02-22 10:59:42 --> UTF-8 Support Enabled
DEBUG - 2016-02-22 10:59:42 --> URI Class Initialized
DEBUG - 2016-02-22 10:59:42 --> Router Class Initialized
DEBUG - 2016-02-22 10:59:42 --> No URI present. Default controller set.
DEBUG - 2016-02-22 10:59:42 --> Output Class Initialized
DEBUG - 2016-02-22 10:59:42 --> Security Class Initialized
DEBUG - 2016-02-22 10:59:42 --> Input Class Initialized
DEBUG - 2016-02-22 10:59:42 --> XSS Filtering completed
DEBUG - 2016-02-22 10:59:42 --> Global POST and COOKIE data sanitized
DEBUG - 2016-02-22 10:59:42 --> Language Class Initialized
DEBUG - 2016-02-22 10:59:42 --> Language Class Initialized
DEBUG - 2016-02-22 10:59:42 --> Config Class Initialized
DEBUG - 2016-02-22 10:59:42 --> Loader Class Initialized
DEBUG - 2016-02-22 10:59:42 --> Controller Class Initialized
DEBUG - 2016-02-22 10:59:42 --> Dashboard MX_Controller Initialized
DEBUG - 2016-02-22 10:59:42 --> Config file loaded: application/config/invoice_plane.php
DEBUG - 2016-02-22 10:59:42 --> Session Class Initialized
DEBUG - 2016-02-22 10:59:42 --> Helper loaded: string_helper
DEBUG - 2016-02-22 10:59:42 --> Session routines successfully run
DEBUG - 2016-02-22 10:59:42 --> Helper loaded: url_helper
DEBUG - 2016-02-22 10:59:42 --> Database Driver Class Initialized
DEBUG - 2016-02-22 10:59:42 --> Helper loaded: form_helper
DEBUG - 2016-02-22 10:59:42 --> Form Validation Class Initialized
DEBUG - 2016-02-22 10:59:42 --> Helper loaded: number_helper
DEBUG - 2016-02-22 10:59:42 --> Helper loaded: pager_helper
DEBUG - 2016-02-22 10:59:42 --> Helper loaded: invoice_helper
DEBUG - 2016-02-22 10:59:42 --> Helper loaded: date_helper
DEBUG - 2016-02-22 10:59:42 --> Helper loaded: redirect_helper
DEBUG - 2016-02-22 10:59:42 --> Model Class Initialized
DEBUG - 2016-02-22 10:59:42 --> File loaded: application/modules/settings/models/mdl_settings.php
DEBUG - 2016-02-22 10:59:42 --> Model Class Initialized
DEBUG - 2016-02-22 10:59:42 --> Language file loaded: language/Serbian (Latin)/ip_lang.php
DEBUG - 2016-02-22 10:59:42 --> Language file loaded: language/Serbian (Latin)/form_validation_lang.php
DEBUG - 2016-02-22 10:59:42 --> Language file loaded: language/Serbian (Latin)/custom_lang.php
DEBUG - 2016-02-22 10:59:42 --> Helper loaded: language_helper
DEBUG - 2016-02-22 10:59:42 --> File loaded: application/controllers/../modules/layout/controllers/layout.php
DEBUG - 2016-02-22 10:59:42 --> Layout MX_Controller Initialized
ERROR - 2016-02-22 10:59:42 --> Severity: Warning  --> Cannot modify header information - headers already sent by (output started at /home/cituljei/public_html/test/application/language/Serbian (Latin)/ip_lang.php:1) /home/cituljei/public_html/test/system/helpers/url_helper.php 543
DEBUG - 2016-02-22 10:59:44 --> Config Class Initialized
DEBUG - 2016-02-22 10:59:44 --> Hooks Class Initialized
DEBUG - 2016-02-22 10:59:44 --> MY Utf8 Initialized - Hack for PHPUnit to run
DEBUG - 2016-02-22 10:59:44 --> UTF-8 Support Enabled
DEBUG - 2016-02-22 10:59:44 --> URI Class Initialized
DEBUG - 2016-02-22 10:59:44 --> Router Class Initialized
DEBUG - 2016-02-22 10:59:44 --> No URI present. Default controller set.
DEBUG - 2016-02-22 10:59:44 --> Output Class Initialized
DEBUG - 2016-02-22 10:59:44 --> Security Class Initialized
DEBUG - 2016-02-22 10:59:44 --> Input Class Initialized
DEBUG - 2016-02-22 10:59:44 --> XSS Filtering completed
DEBUG - 2016-02-22 10:59:44 --> Global POST and COOKIE data sanitized
DEBUG - 2016-02-22 10:59:44 --> Language Class Initialized
DEBUG - 2016-02-22 10:59:44 --> Language Class Initialized
DEBUG - 2016-02-22 10:59:44 --> Config Class Initialized
DEBUG - 2016-02-22 10:59:44 --> Loader Class Initialized
DEBUG - 2016-02-22 10:59:44 --> Controller Class Initialized
DEBUG - 2016-02-22 10:59:44 --> Dashboard MX_Controller Initialized
DEBUG - 2016-02-22 10:59:44 --> Config file loaded: application/config/invoice_plane.php
DEBUG - 2016-02-22 10:59:44 --> Session Class Initialized
DEBUG - 2016-02-22 10:59:44 --> Helper loaded: string_helper
DEBUG - 2016-02-22 10:59:44 --> Session routines successfully run
DEBUG - 2016-02-22 10:59:44 --> Helper loaded: url_helper
DEBUG - 2016-02-22 10:59:44 --> Database Driver Class Initialized
DEBUG - 2016-02-22 10:59:44 --> Helper loaded: form_helper
DEBUG - 2016-02-22 10:59:44 --> Form Validation Class Initialized
DEBUG - 2016-02-22 10:59:44 --> Helper loaded: number_helper
DEBUG - 2016-02-22 10:59:44 --> Helper loaded: pager_helper
DEBUG - 2016-02-22 10:59:44 --> Helper loaded: invoice_helper
DEBUG - 2016-02-22 10:59:44 --> Helper loaded: date_helper
DEBUG - 2016-02-22 10:59:44 --> Helper loaded: redirect_helper
DEBUG - 2016-02-22 10:59:44 --> Model Class Initialized
DEBUG - 2016-02-22 10:59:44 --> File loaded: application/modules/settings/models/mdl_settings.php
DEBUG - 2016-02-22 10:59:44 --> Model Class Initialized
DEBUG - 2016-02-22 10:59:44 --> Language file loaded: language/Serbian (Latin)/ip_lang.php
DEBUG - 2016-02-22 10:59:44 --> Language file loaded: language/Serbian (Latin)/form_validation_lang.php
DEBUG - 2016-02-22 10:59:44 --> Language file loaded: language/Serbian (Latin)/custom_lang.php
DEBUG - 2016-02-22 10:59:44 --> Helper loaded: language_helper
DEBUG - 2016-02-22 10:59:44 --> File loaded: application/controllers/../modules/layout/controllers/layout.php
DEBUG - 2016-02-22 10:59:44 --> Layout MX_Controller Initialized
ERROR - 2016-02-22 10:59:44 --> Severity: Warning  --> Cannot modify header information - headers already sent by (output started at /home/cituljei/public_html/test/application/language/Serbian (Latin)/ip_lang.php:1) /home/cituljei/public_html/test/system/helpers/url_helper.php 543
DEBUG - 2016-02-22 10:59:46 --> Config Class Initialized
DEBUG - 2016-02-22 10:59:46 --> Hooks Class Initialized
DEBUG - 2016-02-22 10:59:46 --> MY Utf8 Initialized - Hack for PHPUnit to run
DEBUG - 2016-02-22 10:59:46 --> UTF-8 Support Enabled
DEBUG - 2016-02-22 10:59:46 --> URI Class Initialized
DEBUG - 2016-02-22 10:59:46 --> Router Class Initialized
DEBUG - 2016-02-22 10:59:46 --> No URI present. Default controller set.
DEBUG - 2016-02-22 10:59:46 --> Output Class Initialized
DEBUG - 2016-02-22 10:59:46 --> Security Class Initialized
DEBUG - 2016-02-22 10:59:46 --> Input Class Initialized
DEBUG - 2016-02-22 10:59:46 --> XSS Filtering completed
DEBUG - 2016-02-22 10:59:46 --> Global POST and COOKIE data sanitized
DEBUG - 2016-02-22 10:59:46 --> Language Class Initialized
DEBUG - 2016-02-22 10:59:46 --> Language Class Initialized
DEBUG - 2016-02-22 10:59:46 --> Config Class Initialized
DEBUG - 2016-02-22 10:59:46 --> Loader Class Initialized
DEBUG - 2016-02-22 10:59:46 --> Controller Class Initialized
DEBUG - 2016-02-22 10:59:46 --> Dashboard MX_Controller Initialized
DEBUG - 2016-02-22 10:59:46 --> Config file loaded: application/config/invoice_plane.php
DEBUG - 2016-02-22 10:59:46 --> Session Class Initialized
DEBUG - 2016-02-22 10:59:46 --> Helper loaded: string_helper
DEBUG - 2016-02-22 10:59:46 --> Session routines successfully run
DEBUG - 2016-02-22 10:59:46 --> Helper loaded: url_helper
DEBUG - 2016-02-22 10:59:46 --> Database Driver Class Initialized
DEBUG - 2016-02-22 10:59:46 --> Helper loaded: form_helper
DEBUG - 2016-02-22 10:59:46 --> Form Validation Class Initialized
DEBUG - 2016-02-22 10:59:46 --> Helper loaded: number_helper
DEBUG - 2016-02-22 10:59:46 --> Helper loaded: pager_helper
DEBUG - 2016-02-22 10:59:46 --> Helper loaded: invoice_helper
DEBUG - 2016-02-22 10:59:46 --> Helper loaded: date_helper
DEBUG - 2016-02-22 10:59:46 --> Helper loaded: redirect_helper
DEBUG - 2016-02-22 10:59:46 --> Model Class Initialized
DEBUG - 2016-02-22 10:59:46 --> File loaded: application/modules/settings/models/mdl_settings.php
DEBUG - 2016-02-22 10:59:46 --> Model Class Initialized
DEBUG - 2016-02-22 10:59:46 --> Language file loaded: language/Serbian (Latin)/ip_lang.php
DEBUG - 2016-02-22 10:59:46 --> Language file loaded: language/Serbian (Latin)/form_validation_lang.php
DEBUG - 2016-02-22 10:59:46 --> Language file loaded: language/Serbian (Latin)/custom_lang.php
DEBUG - 2016-02-22 10:59:46 --> Helper loaded: language_helper
DEBUG - 2016-02-22 10:59:46 --> File loaded: application/controllers/../modules/layout/controllers/layout.php
DEBUG - 2016-02-22 10:59:46 --> Layout MX_Controller Initialized
ERROR - 2016-02-22 10:59:46 --> Severity: Warning  --> Cannot modify header information - headers already sent by (output started at /home/cituljei/public_html/test/application/language/Serbian (Latin)/ip_lang.php:1) /home/cituljei/public_html/test/system/helpers/url_helper.php 543
DEBUG - 2016-02-22 10:59:49 --> Config Class Initialized
DEBUG - 2016-02-22 10:59:49 --> Hooks Class Initialized
DEBUG - 2016-02-22 10:59:49 --> MY Utf8 Initialized - Hack for PHPUnit to run
DEBUG - 2016-02-22 10:59:49 --> UTF-8 Support Enabled
DEBUG - 2016-02-22 10:59:49 --> URI Class Initialized
DEBUG - 2016-02-22 10:59:49 --> Router Class Initialized
DEBUG - 2016-02-22 10:59:49 --> Output Class Initialized
DEBUG - 2016-02-22 10:59:49 --> Security Class Initialized
DEBUG - 2016-02-22 10:59:49 --> Input Class Initialized
DEBUG - 2016-02-22 10:59:49 --> XSS Filtering completed
DEBUG - 2016-02-22 10:59:49 --> Global POST and COOKIE data sanitized
DEBUG - 2016-02-22 10:59:49 --> Language Class Initialized
DEBUG - 2016-02-22 10:59:49 --> Language Class Initialized
DEBUG - 2016-02-22 10:59:49 --> Config Class Initialized
DEBUG - 2016-02-22 10:59:49 --> Loader Class Initialized
DEBUG - 2016-02-22 10:59:49 --> Controller Class Initialized
DEBUG - 2016-02-22 10:59:49 --> Setup MX_Controller Initialized
DEBUG - 2016-02-22 10:59:49 --> Session Class Initialized
DEBUG - 2016-02-22 10:59:49 --> Helper loaded: string_helper
DEBUG - 2016-02-22 10:59:49 --> Session routines successfully run
DEBUG - 2016-02-22 10:59:49 --> Helper loaded: file_helper
DEBUG - 2016-02-22 10:59:49 --> Helper loaded: directory_helper
DEBUG - 2016-02-22 10:59:49 --> Helper loaded: url_helper
DEBUG - 2016-02-22 10:59:49 --> Helper loaded: language_helper
DEBUG - 2016-02-22 10:59:49 --> Model Class Initialized
DEBUG - 2016-02-22 10:59:49 --> File loaded: application/modules/setup/models/mdl_setup.php
DEBUG - 2016-02-22 10:59:49 --> Model Class Initialized
DEBUG - 2016-02-22 10:59:49 --> File loaded: application/controllers/../modules/layout/controllers/layout.php
DEBUG - 2016-02-22 10:59:49 --> Layout MX_Controller Initialized
DEBUG - 2016-02-22 10:59:49 --> Language file loaded: language/Serbian (Latin)/ip_lang.php
ERROR - 2016-02-22 10:59:49 --> Severity: Warning  --> Cannot modify header information - headers already sent by (output started at /home/cituljei/public_html/test/application/language/Serbian (Latin)/ip_lang.php:1) /home/cituljei/public_html/test/system/helpers/url_helper.php 543

This is code

if ( ! function_exists('redirect'))
{
	function redirect($uri = '', $method = 'location', $http_response_code = 302)
	{
		if ( ! preg_match('#^https?://#i', $uri))
		{
			$uri = site_url($uri);
		}

		switch($method)
		{
			case 'refresh'	: header("Refresh:0;url=".$uri);
				break;
this is line 543		default			: header("Location: ".$uri, TRUE, $http_response_code);
				break;
		}
		exit;
	}
}

Please change your language to english directly in the database and try again. It’s the default_language setting.

I change language to english, platform works ok, but when I change in platform language in Serbian app down

What is problem?

Maybe there are some wrong language strings in the serbian language file. Please head over to http://translations.invoiceplane.com/project/fusioninvoice to talk to the language contributors.