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I'm not sure this is the cause of your issue, but thought I'd report my experiences anyway:

I've seen this error popup on systems that had multiple installations of python-catkin-pkg. Most of the times these systems had the binary debian ánd a from-source version installed (through pip). The pip versions were in /usr/local/lib/python2.7/dist-packages/.., with the debian packaged ones being in /usr/lib/python2.7/dist-packages/...

Manually removing all catkin-pkg related files and directories under /usr/local/lib/.. and reinstalling the python-catkin-pkg got things working again.

I'm not sure this is the cause of your issue, but thought I'd report my experiences anyway:

I've seen this error popup on systems that had multiple installations of python-catkin-pkg. Most of the times these systems had the binary debian ánd a from-source version installed (through pip). The pip versions were in /usr/local/lib/python2.7/dist-packages/.., with the debian packaged ones being in /usr/lib/python2.7/dist-packages/... (note the local).

Manually removing all catkin-pkg related files and directories under /usr/local/lib/.. and reinstalling the python-catkin-pkg got things working again.