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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.
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