Warning: Undefined variable $dst_img in C:\xampp\htdocs\thumb.php on line 22

Fatal error: Uncaught TypeError: imagejpeg(): Argument #1 ($image) must be of type GdImage, null given in C:\xampp\htdocs\thumb.php:22 Stack trace: #0 C:\xampp\htdocs\thumb.php(22): imagejpeg(NULL, 'C:\\xampp\\htdocs...', 90) #1 {main} thrown in C:\xampp\htdocs\thumb.php on line 22