I havent worked with that forum script before but I would first start with where the error tells you.
Quote:
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This is either because it was not in the correct format, or the file size was larger than that allowed
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Is there a location to define what filetypes are allowed to be uploaded? If so verify that the filetype thats trying to be uploaded is listed. Spelling may affect this I dont know.
If the filetype is confirmed then whats the image size in compairson to the filesize specification. If you cant specify the file size with the script then it might be a PHP limit imposed by your host.