I installed the svntag plugin for hudson but an error is raised upon runtime because my SVN URL contains some unusual characters (actually spaces). I don't have any screenshot with the error message sorry but the problem can easily be reproduced.

My URL looks like "svn://servername/Policy Lines/version/trunk" (note the space character)

I worked around the issue by patching the plugin source (see attachment).

The fix is really dirty since I had to fix it very quickly and i'm not fluent with hudson's internals. Please consider it as an hint of what should be done to fix the issue.