Error Updating file from the server

[Gagneet Singh]

Hi!
 
When updating a lex generated file from my CVS repository, I am getting
the following error:
 
cvs update -P -r 1.12 lex.yy.c (in directory D:\My
Documents\Project_Version_Control\project\)

cvs [server aborted]: invalid change text in
/cvs/versions/project/lex.yy.c,v

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


This problem occurs when I try to checkout a revision 1.12 or older. The
current revision is 1.63 and I can check out all the revisions till the
1.13 revision. 
Although I am using the WinCVS GUI, even when I try via the command line
on the cvs server, the same problem is encountered.

Could someone tell me what is the problem and if it can be solved in any
way. 

I have admin access to the CVS server. The configuration is as follows:

Server: cvs 1.11.2 (client/server) on a Red Hat 9.0 distribution.

Client WinCVS: 1.3b13-2

Thank you,

Gagneet