Error adding file to existing repository

[John Lippiello]

Hi

I have created my first repository and entered a module into 
CVS with the tag, "V5-5_2002-07-26".  I have this module 
checked out using this tag.  Today, I discovered that a file
was missing in my original submission to CVS.  I am trying to 
"add" the file to the repository and it is giving the 
following error message (in WinCVS):

----------------------------------------------------------------
cvs add filename.c (in directory E:\PathToFilename\)
cvs server: cannot add file on non-branch tag V5-5_2002-07-26


*****CVS exited normally with code 1*****
----------------------------------------------------------------


I simply want to add the file to the repository and tag it with 
the same tag.  This seems like a very simple process.  I have 
a Linux server and WinCVS on a Windows 2000 machine.

Any ideas?

Thanks in Advance
John