Error (-4) during syncing

Hi,     
as in topic, while i'm synicng my iPhone I get this prompt: "Attempting to copy to the disk "Macintosh HD" failed. An unknown error occured (-4).
So far I read some solutions and I did change my permission for Music and all enclosed folders. It did not work.
Also I read that it might be a problem with server connection, but as far as I don't have any trouble downloading things from iTS I don't thing that's a case.
Do you have any ideas?
It happend unexpectedly. The only thing I've changed was that I erased all my music from iPhone and now i wanted to resync it, but I got the error....
iT v.11.2.1 (1)
64bit

Hello there, Wyrzezbiator.
The following Knowledge Base article offers some great steps for the very issue you're describing:
Resolve specific iTunes update and restore errors
http://support.apple.com/kb/ts3694#4
Configure your security software
Related errors: 2, 4, 6, 9, 1000, 1611, 9006, 9807, or 9844. Sometimes as a result of this issue, a device might stop responding during the restore process.
Check your security software and settings, which can block ports and prevent connection to Apple servers during update and restore.
Thanks for reaching out to Apple Support Communities.
Cheers,
Pedro.

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