Fatal error: Uncaught Error: Call to undefined function app_detect_lang() in /home/trainnee001/work/public_html_PAYMENT_DEV/src/handlers/test.php:6 Stack trace: #0 /home/trainnee001/work/public_html_PAYMENT_DEV/src/App.php(45): require() #1 /home/trainnee001/work/public_html_PAYMENT_DEV/index.php(38): App\App::handle() #2 {main} thrown in /home/trainnee001/work/public_html_PAYMENT_DEV/src/handlers/test.php on line 6