Only the error stack:
DEBUG - 2017-11-22 15:28:35 --> UTF-8 Support Enabled
DEBUG - 2017-11-22 15:28:35 --> Global POST, GET and COOKIE data sanitized
DEBUG - 2017-11-22 15:28:35 --> Invoices MX_Controller Initialized
DEBUG - 2017-11-22 15:28:35 --> Config file loaded: /var/www/mallo/invoiceplane/application/config/invoice_plane.php
DEBUG - 2017-11-22 15:28:35 --> Encryption: Auto-configured driver ‘openssl’.
DEBUG - 2017-11-22 15:28:35 --> File loaded: /var/www/mallo/invoiceplane/application/modules/settings/models/Mdl_settings.php
DEBUG - 2017-11-22 15:28:35 --> File loaded: /var/www/mallo/invoiceplane/application/controllers/…/modules/layout/controllers/Layout.php
DEBUG - 2017-11-22 15:28:35 --> Layout MX_Controller Initialized
DEBUG - 2017-11-22 15:28:35 --> File loaded: /var/www/mallo/invoiceplane/application/modules/invoices/models/Mdl_invoices.php
DEBUG - 2017-11-22 15:28:35 --> File loaded: /var/www/mallo/invoiceplane/application/modules/invoices/models/Mdl_items.php
DEBUG - 2017-11-22 15:28:35 --> File loaded: /var/www/mallo/invoiceplane/application/modules/invoices/models/Mdl_invoice_tax_rates.php
DEBUG - 2017-11-22 15:28:35 --> File loaded: /var/www/mallo/invoiceplane/application/modules/custom_fields/models/Mdl_custom_fields.php
DEBUG - 2017-11-22 15:28:35 --> File loaded: /var/www/mallo/invoiceplane/application/modules/payment_methods/models/Mdl_payment_methods.php
DEBUG - 2017-11-22 15:28:35 --> File loaded: /var/www/mallo/invoiceplane/application/modules/payments/models/Mdl_payments.php
DEBUG - 2017-11-22 15:28:35 --> File loaded: /var/www/mallo/invoiceplane/application/modules/custom_fields/models/Mdl_invoice_custom.php
DEBUG - 2017-11-22 15:28:35 --> File loaded: /var/www/mallo/invoiceplane/application/modules/custom_values/models/Mdl_custom_values.php
DEBUG - 2017-11-22 15:28:35 --> File loaded: /var/www/mallo/invoiceplane/application/modules/custom_fields/models/Mdl_client_custom.php
DEBUG - 2017-11-22 15:28:35 --> File loaded: /var/www/mallo/invoiceplane/application/modules/custom_fields/models/Mdl_user_custom.php
DEBUG - 2017-11-22 15:28:35 --> File loaded: /var/www/mallo/invoiceplane/application/views/invoice_templates/pdf/default.php
ERROR - 2017-11-22 15:28:35 --> Severity: error --> Exception: Could not find PostScript font name: /var/www/mallo/invoiceplane/vendor/mpdf/mpdf/src/Config/…/…/ttfonts/DejaVuSerifCondensed.ttf /var/www/mallo/invoiceplane/vendor/mpdf/mpdf/src/TTFontFile.php 722