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Null pointer exception when trying to use Concept Drift Plugin
I am trying to use the Concept Drift Plugin (developed by J. C Bose) but I always get a Null Pointer exception. I have tried with different combinations and with simple datasets (for instance, the dataset from Process Mining book - Aalst) and I always get this error. Could anyone help me with this plugin? It is a problem in ProM 6.9 version?