It show this page isn't work after click add client

i am new to invoiceplane, i get a error after i install the ip and finished setup.
it show me the below data after i click the add client link.

This page isn’t working

localhost didn’t send any data.
ERR_EMPTY_RESPONSE

but i confirmed that i had already rename the ipconfig.php and setup the db.

and it show no error on the logs file.

DEBUG - 2017-10-14 11:47:24 --> UTF-8 Support Enabled
DEBUG - 2017-10-14 11:47:24 --> Global POST, GET and COOKIE data sanitized
DEBUG - 2017-10-14 11:47:24 --> Clients MX_Controller Initialized
DEBUG - 2017-10-14 11:47:24 --> Config file loaded: /Users/chiwangsou/Sites/invoiceplane/application/config/invoice_plane.php
DEBUG - 2017-10-14 11:47:24 --> Encryption: Auto-configured driver ‘openssl’.
DEBUG - 2017-10-14 11:47:24 --> File loaded: /Users/chiwangsou/Sites/invoiceplane/application/modules/settings/models/Mdl_settings.php
DEBUG - 2017-10-14 11:47:24 --> File loaded: /Users/chiwangsou/Sites/invoiceplane/application/controllers/…/modules/layout/controllers/Layout.php
DEBUG - 2017-10-14 11:47:24 --> Layout MX_Controller Initialized
DEBUG - 2017-10-14 11:47:24 --> File loaded: /Users/chiwangsou/Sites/invoiceplane/application/modules/clients/models/Mdl_clients.php

my system is macos sierra , and php version is 5.7 , and the ip version is 1.5.4, and the mysql version is 5.7.

I found the error line . it is client/form line129

129 $this->load->model(‘custom_fields/mdl_custom_fields’);
130 $this->load->model(‘custom_values/mdl_custom_values’);
131 $this->load->model(‘custom_fields/mdl_client_custom’);

i have set a break after line 129, it show the error message.

it 's weird that why just load model , and didn’t run , it also create error.

Are you serious?!

Firstly stop spamming this forum with all your logs! Please use http://paste.invoiceplane.com/

Secondly read the massive red box at the top of this page! This is issue has been mentioned and resolved countless times InvoicePlane 1.5.4 released

thanks a lot.
it help me so much.
i am new in invoiceplane.
and find it many times, but still didn’t find the solution .
anyway thank very much.