Fatal error: Uncaught TypeError: extract(): Argument #1 ($array) must be of type array, null given in C:\xampp\htdocs\Course\fromCourse.php:23 Stack trace: #0 C:\xampp\htdocs\Course\fromCourse.php(23): extract(NULL) #1 {main} thrown in C:\xampp\htdocs\Course\fromCourse.php on line 23