Fatal error: Uncaught TypeError: imagepalettetotruecolor(): Argument #1 ($image) must be of type GdImage, string given in C:\xampp\htdocs\thumb.php:20 Stack trace: #0 C:\xampp\htdocs\thumb.php(20): imagepalettetotruecolor('C:\\xampp\\htdocs...') #1 {main} thrown in C:\xampp\htdocs\thumb.php on line 20