Fatal error: Uncaught TypeError: set_error_handler(): Argument #1 ($callback) must be a valid callback or null, function "errorHandler" not found or invalid function name in /mnt/www/myframe/main_loader.php:38 Stack trace: #0 /mnt/www/myframe/main_loader.php(38): set_error_handler('errorHandler') #1 /mnt/www/myframe/index.php(10): include_once('/mnt/www/myfram...') #2 {main} thrown in /mnt/www/myframe/main_loader.php on line 38