cvs Permission denied

Error message:

Logging in to :pserver:wu@172.22.113.181:2401/cvs
CVS password: 
[zh@localhost ~]$ rm -rf DRS-1.0/
[zh@localhost ~]$ cvs checkout -r flbranch DRS-1.0
cvs checkout: failed to create lock directory for `/cvs/DRS-1.0' (/cvs/DRS-1.0/#cvs.lock): Permission denied
cvs checkout: failed to obtain dir lock in repository `/cvs/DRS-1.0'
cvs [checkout aborted]: read lock failed - giving up

Solution:

Need to add user to cvs group

[root@NTRCVS ~]# usermod -a -G cvs wu
[root@NTRCVS ~]# id wu
uid=501(wu) gid=501(wu) groups=501(wu),502(cvs)