Attachments and galleries problem

[محروم.كوم]

Hello.
i have chmoded attachments directory to 777, also chmoded tmp dir, but still, when uploading any attachment i get
"Could not create file system directory to hold your attachment. "

error.
in admin cp diagnostics goes ok.
Code:
file_uploads: On
open_basedir: None
safe_mode: Off
upload_tmp_dir: /var/www/vhosts/tibiaspy.com/subdomains/forum/httpdocs/tmp
upload_max_filesize: 12.00 MB

No errors occurred while opening the uploaded file for reading.
Some other scripts, like PHP Fusion does not have problems with attachments, so it is something with vB.
What am i doing wrong?
I have Plesk linux on my server and root access, so i can change configuration if it is needed. __DEFINE_LIKE_SHARE__