pserver doesn't work

[somayeh afzali]

when i run pserver, this error is shown:
 
 # cvs -d pserver:1234:address@hidden:/var/lib/cvsroot login
 Logging in to pserver:address@hidden:2401/var/lib/cvsroot
 
 # cvs -d pserver:address@hidden:/var/lib/cvsroot checkout Socketprograming/
 
 cvs checkout: failed to create lock directory for `/var/lib/cvsroot/CVSROOT' (/var/lib/cvsroot/CVSROOT/#cvs.history.lock): Permission denied
 cvs checkout: failed to obtain history lock in repository `/var/lib/cvsroot'
 cvs checkout: Updating Socketprograming
 cvs checkout: failed to create lock directory for `/var/lib/cvsroot/Socketprograming' (/var/lib/cvsroot/Socketprograming/#cvs.lock): Permission denied
 cvs checkout: failed to obtain dir lock in repository `/var/lib/cvsroot/Socketprograming'
 cvs [checkout aborted]: read lock failed - giving up
 
 please help me

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