rewrite works but throws File Not Found error

From the perspective of someone visiting my site, the rewrite rule works fine, but meanwhile the server throws errors.

Here's the rule:

RewriteRule ^Other-Question/Ok-an-important-Olympic-Games-question/Q([a-zA-Z0-9]+)/F([0-9]+)$ Answers_Display.php?q=$1&format=$2

And here is the error:
www.myserver.com [Fri Aug 15 14:39:53 2008] [error] [client 70.23.83.149] File does not exist: /usr/www/users/moi/Stage/Other-Question, referer: http://myserver.com/Other-Question/O...Qv8bkjpqgjx/F5

Any clues?
Thanks.

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Thanks