Probleme Mit Stapelverarbeitung Bei Bildern

[ttdrobin]

Beim XTC Modul Bildverarbeitung kommt bei mir immer folgender fehler:

Warning: imagecolorclosest(): supplied argument is not a valid Image resource in /home/htdocs/web2/html/admin/includes/classes/image_manipulator.php on line 215

Warning: imagecolorclosest(): supplied argument is not a valid Image resource in /home/htdocs/web2/html/admin/includes/classes/image_manipulator.php on line 215

Warning: Cannot modify header information - headers already sent by (output started at /home/htdocs/web2/html/admin/includes/classes/image_manipulator.php:215) in /home/htdocs/web2/html/admin/includes/functions/general.php on line 146

Was muss denn alles gegeben sein damit das Modul funktioniert?

mfg
Robin