[TYPO3] http post files returns error: 4 after looking at debug - how do I find out what those errors are and where they are?

[dave typo]

when I type

debug($GLOBALS["HTTP_POST_FILES"]);


within an if statement, I get a return output that says:


userfile        
            name        
            type        
            tmp_name    
            error                4
            size                 0



so my question is, how do I find out what those four errors are, or
where they are? a single numbered output doesn't really tell me much..



thanks for your help.

-dave
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