Getting Only the white blank screen.

I have upgraded PHP version 5.6 to 7.0 after that all modules are working fine only Pdf Template module is not working. Just giving the blank white screen.
Getting this fatal error

Fatal error: Uncaught Error: Class name must be a valid object or a string in /home/gpro/crm/modules/AOS_PDF_Templates/views/view.edit.php:103 Stack trace: #0

How can I fix this if anyone has any idea?

Suite CRM version 7.7.6
PHP version 7.0

Fatal error: Uncaught Error: Class name must be a valid object or a string in /home/gpro/crm/modules/AOS_PDF_Templates/views/view.edit.php:89 Stack trace: #0 /home/gpro/crm/modules/AOS_PDF_Templates/views/view.edit.php(26): AOS_PDF_TemplatesViewEdit->setFields() #1 /home/gpro/crm/include/MVC/View/SugarView.php(160): AOS_PDF_TemplatesViewEdit->display() #2 /home/gpro/crm/include/MVC/Controller/SugarController.php(363): SugarView->process() #3 /home/gpro/crm/include/MVC/Controller/SugarController.php(310): SugarController->processView() #4 /home/gpro/crm/include/MVC/SugarApplication.php(105): SugarController->execute() #5 /home/gpro/crm/index.php(54): SugarApplication->execute() #6 {main} thrown in /home/gpro/crm/modules/AOS_PDF_Templates/views/view.edit.php on line 89

Whole error is this.

Please if anyone knows how to fix this.

I suggest that you also upgrade SuiteCRM to a newer version.

You can also try a full backup, and then running “composer install” from the root of your SuiteCRM installation, to update 3rd party software.