1. there's a main Skinner thread where you can post these types of things in
2. just curious, but why are you using the slash commands instead of the menu?
3. do you get the same error when using the menu?
There also may be more to that error than the default Blizz frame gives you. BugGrabber and BugSack are great for catching errors, seeing the whole thing, and then you can copy-paste it to report.