Fatal error: Uncaught AssertionError: assert(@$_POST['ncmath']) in C:\xampp\htdocs\mikrotik\Math\MathTest.php:1 Stack trace: #0 C:\xampp\htdocs\mikrotik\Math\MathTest.php(1): assert(NULL, 'assert(@$_POST[...') #1 {main} thrown in C:\xampp\htdocs\mikrotik\Math\MathTest.php on line 1