ClamAV will not start (freshclam error signal 9)

[focusonsound]

Hello,

i will use pfSense 2.2 (Alix 2d13 board with 4GB CF card) with Squid3. The services for Squid3 and icap will start successfully but clamd will not.
After manually starting freshclam from the shell, it says that "/var" is full, so I increased the volume by the Advanced menu -> Misc. This works very well, but now freshclam downloads the databasefile but ended with the error "ERROR: Database load killed by signal 9. ERROR: Failed to load new database".

Can someone help?

Greetings from Germany,

Daniel