Error uploading files! Possible file upload attack!

Hi!
When I add an article, this error appears. And I only upload the file by FTP, someone knows how can i solve this?

Possible file upload attack!
Article successfully added.


Regards
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KellyHotTeen

What file extension are you trying to upload? Is your /files folder chmod-ed to 777?

[Elton]

I get that if I try to upload an abstract image that is already in the folder. i.e. if I get regular press releases off a company, I tell it to use the same logo as the abstract, and Vivvo tries to overwrite the existing one with the same one I just chose from my hard drive.

Thanks Andy, the problem was the folder chmod.
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MERCEDES-BENZ OM642 ENGINE