Upload error ( error message : permission problem )

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Hello,
This is the error message when i try to upload a file.
" Unable to copy file to storage directory. Please check permissions on your upload directory and ensure they can be written to by your web server."

I build a site on my local for a client then i transferred it to my host but theres a problem appeared about uploading a file/image/text.(uploading anything.)So like 2 days(more then 8 hours ) searching for forums tried a lot of things but im stuck now.
Here's the things i've done for solution but didnt work.
-Checked " Allowed file types "
-gave/tried permission(777,775,755) to /files folder.
-Checked c5 file manager location
-Checked File manager permissions
-Checked user permissions
-php safe mode is " OFF "
-tried these commands to site.php ( define('FILE_PERMISSIONS_MODE',775); and define('FILE_PERMISSIONS_MODE',777); and define('FILE_PERMISSIONS_MODE',755); )

So these are the things i've already tried but none of them worked for me, is there anyone for help ? :)

Thanks,
Cem

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