Problem renaming Files!

[Alex Mahmoud]

Hello!
I have the following Problem: Yesterday I commited 3 .java Files to our
Project-Repository. Unfortunately, I didn't take care of the naming
convention and let all three files start with a small letter (i.e.
getUsersByTopicTag.java). Then, I tried to remove those files and add the
ones starting with capital letter, but of course, having the same name. It
did not work. Everytime, I executed the commit command, I got following
error message: cvs server: cannot add file
`src/de/epythia/usertopics/tag/GetUsersByTopicTag.java' when RCS file
`/usr/local/cvs/Epy-UserTopics/src/de/epythia/usertopics/tag/GetUsersByTopic
Tag.java,v' already exists
cvs [server aborted]: correct above errors first!
I also tried to solve that problem in the way it is explained in the
CVS-Book. I mean the part about renaming files. But it didn't work too.
Could you please tell me what I can do to correct those file names.
Best greetings,

Alex Mahmoud