error ClamAV daemon

[Peter Lesterhuis]

Hi,
When I boot I see this message: "ClamAV daemon: ERROR: can't open 
/var/log/clamav/clamlog in append mode. Check permissions. ERROR: 
problem with internal logger. Please check permissions of 
/var/log/clamav/clamlog."
I checked the permissions (600) and set them to 666 to be sure that the 
file is writable for the owner clamav. (Shouldn't be necessary though).
Still I can't start clamd.
In clamav.conf the option LogFileUnlock is uncommented.
I don't understand why I keep having this error.
Any suggestion is wellcome.
Peter.