qStudio QueryManager IllegalArgumentException checkArgument refreshWatched

If you get an error such as this:

This is due to a watched variable problem. Watched expressions are expressions that get queried every single time a user sends a query. In my experience most people haven't intentionally set a watch, you can remove that watch in the expressions window, shown in the image on the bottom. We recently changed the keyboard shortcut to prevent accidental watches being added.