EOF while looking for end of string

[KK]

Hi CVS experts

I had a repository on a server  (RedHat Linux 7.3) working right.
Later, for maintenance  we reinstalled the server and we replaced the
repository files
from our backup which was compressed using WinZip
and I found this
error when I try to get the clean copy from my local version.
This is the error:
*****CVS exited normally with code 1*****


cvs update -C Some_File.mdx (in directory D:\Users\Krishna\CVS-WD\training\)
cvs [server aborted]: EOF while looking for end of string in RCS file
D:\Users\Krishna\CVS-WD\training\Some_File.mdx,v

*****CVS exited normally with code 1*****
Can anybody help me with this problem.
Thanks in advance
Rgds
Krishna