I don\'t know if this hook is out-of-box or if mine is just messed up and I just need to replace it but when I go and try to edit a log comment on a commit I get this error mess
Just a little follow-up to Stefan's excellent answer for those using VisualSVN Server.
You can follow these steps:
1.) Start your VisualSVN Server Management Console.
2.) Right-click on your repository-of-choice and select "Properties":

3.) Select the "Pre-revision property change hook" and click the Edit button:

4.) Enter your script, the smallest possible would be the exit 0 that Stefan suggests:

5.) Close all dialog boxes with OK and then you are done.
The next time you change the log message it should succeed.