screen: failed to write the picture

Hey. Just tried to use your demo code and this is what I got from nginx:

FastCGI sent in stderr: "PHP message: PHP Warning: filesize(): stat failed for test.jpg in /httpdocs/test.php on line 42 PHP message: PHP Warning: readfile(test.jpg): failed to open stream: No such file or directory in /httpdocs/test.php on line 43" while reading response header from upstream

Thx for your package anyway