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I ran into this as well. Problem is ros-groovy-class-loader is older than your ros-groovy-rviz. The complete but slow solution is:

sudo apt-get update
sudo apt-get dist-upgrade

This installs the latest version of every software package currently installed. Can take hours if you haven't done it in a while.

The faster solution which just solves this one problem is:

sudo apt-get update
sudo apt-get install ros-groovy-class-loader

The second one fixed it for me anyway. I'll start the slow one just before I leave work.