class.upload.php is a powerful and mature PHP class to manage uploaded files, and manipulate images in many ways. The script is available under a GPL license.
more info about the class
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I dont know how to avoid this error.
Sorry for my bad english. I understand it but I can`t explain myself
Thans and regards
You can make sure that your server has the file utility, or deactivate this method of detection in the class. See this part of the doc.