http://www.icyphoenix.com/viewtopic.php?f=24&t=1649&p=12225#p12225
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Mighty Gorgon
Sun 15 Apr, 2007 20:37

Re: Fatal Error: Call To Undefined Function: Checkflag() In.
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I think you didn't upload all files correctly, try to delete all old PHP album files and reupload the new ones.