Fatal error: Uncaught Error: Undefined constant "MCRYPT_KEY" in D:\xampp\htdocs\modules\signup\index.php:5 Stack trace: #0 D:\xampp\htdocs\index.php(411): require() #1 D:\xampp\htdocs\index.php(572): pfcApplication->run() #2 D:\xampp\htdocs\cht\index.php(7): include('D:\\xampp\\htdocs...') #3 {main} thrown in D:\xampp\htdocs\modules\signup\index.php on line 5