[cvsnt] Could not open Lock file /path/to/file : Permission Denied

[Thomas Bartolucci]

I installed cvsnt and I can create projects, check things out edit them, 
but when I go to commit anything I get this error:

cvs commit: Examining .
Checking in index.html;
/var/lib/cvs/calendar/index.html,v  <--  index.html
new revision: 1.2; previous revision: 1.1
cvs [commit aborted]: could not open lock file 
`/var/lib/cvs/calendar/,index.html,': Permission denied

What permissions could be wrong?