Add File error "Failed to upload file."

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I am unable to upload files using the file plugin.
It will always display an error "Failed to upload file."

How would I go about finding the cause of this problem?

Thanks for any help :) Marty

Any details in /cache/log.php ?

Are the permissions set correctly? On Windows you need to explicitly set write permissions. On Unix you need to do a chmod 755.

How big is the file? There are limits on the size.