[svn] SVN Error: Commit blocked by pre-commit hook (exit code 1) with output: Error: n/a (6)

A pre-commit hook is something that runs on the server, so this probably has nothing to do with your local setup. It could be that you changed something in a settings panel on myversioncontrol.com that is implemented using a pre-commit hook or the myversioncontrol people made an error and added a non-functioning hook.