500 Error when accessing Common App Forms

Fatal error: Uncaught TypeError: Cannot access offset of type string on string in /var/www/vhosts/dev.cte-360.com/httpdocs/Controllers/CommonApp.php:81 Stack trace: #0 /var/www/vhosts/dev.cte-360.com/httpdocs/Framework/Router/ControllerCaller.php(274): Controllers\CommonApp->Forms() #1 /var/www/vhosts/dev.cte-360.com/httpdocs/index.php(285): Framework\Router\ControllerCaller::call_global() #2 {main} thrown in /var/www/vhosts/dev.cte-360.com/httpdocs/Controllers/CommonApp.php on line 81

When debugging more, it shows an error of Resource not found.