CVS problem

I can't do `cvs update -d -P'.  I get the following error:

cvs server: failed to create lock directory for `/projects/cvsroot/pgsql/contrib/pgcrypto/expected' (/projects/cvsroot/pgsql/contrib/pgcrypto/expected/#cvs.lock): Permission denied
cvs server: failed to obtain dir lock in repository `/projects/cvsroot/pgsql/contrib/pgcrypto/expected'
cvs [server aborted]: read lock failed - giving up

Ian