[cvsnt] cvs [server aborted]: "add" requires write access to the repository

[Tuan]

Does anybody know why I am getting this message and how I can fix it?  I 
checked out a module from my repository and when I try to add a file to 
the repository I get the following message returned to me and the 
command is aborted:

cvs [server aborted]: "add" requires write access to the repository

I am using Concurrent Versions System (CVSNT) 2.5.03 (Scorpio) Build 
2382 (client/server) with SmartCVS Foundation 6.0.7 as the client GUI 
front end.