Fatal error: Uncaught TypeError: extract(): Argument #1 ($array) must be of type array, null given in /home/readindia/public_html/course-detail.php:19 Stack trace: #0 /home/readindia/public_html/course-detail.php(19): extract() #1 {main} thrown in /home/readindia/public_html/course-detail.php on line 19