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Fatal error: Uncaught ValueError: imagecreatetruecolor(): Argument #1 ($width) must be greater than 0 in /opt/lampp/htdocs/roger/verification_image_displayer.php:56 Stack trace: #0 /opt/lampp/htdocs/roger/verification_image_displayer.php(56): imagecreatetruecolor(NULL, NULL) #1 {main} thrown in /opt/lampp/htdocs/roger/verification_image_displayer.php on line 56