problem with vsftpd. filesystem full

[vladone]

I have an user, that can acces ftp throught user and pass. (real user
not virtual).
after i upload some file to ftp server i receive this error in
console:
pid 12372 (vsftpd), uid 1005 inumber 8413 on /: filesystem full

uid 1005 is id number for this user.
I can't upload anything. My upload stop about 192kb, then try rewrite
and acces is forbidden.

What cause this error?