Can check out file but not show history for it!

[Goran]

When i commited a file to a repository the owner of that file was
root(it should not have been so) and now when i try to look at the
history for this file with 'cvs -f log' i get the following error: cvs
[log aborted]: unexpected '\x0' reading revision number in RCS file
/mnt/G/cvs/alarm/alarm.c,v
There is no problem to check out the file but when I try to view the
history i get that problem. What have i done worong and how can I fix
this?

Regards,
Goran