A recent bug report on stackoverflow prompted me to make new releases of the python-weka-wrapper/python-weka-wrapper3 libraries.
The reasons for the problem were incorrectly packaged jars inside the weka.jar (mtl.jar, core.jar, arpack_combined_all.jar), resulting in M5P failing to find all its required classes. After repackaging the classes and making a new weka.jar it is working again.
The new versions are as follows:
- python-weka-wrapper: 0.3.11
- python-weka-wrapper3: 0.1.3