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Hi I applied conformance checker plug-in (prom5.2) on Petri net model of a heuristic net, for both log and model diagnostic perspectives it was working fine.But recently the log perspective is not appeared and first error " An internal error occurred while updating the visualization" is appeared and then this error "not found.java.lang.NullPointerException" is appeared at the bottom of the page. However the model perspective is working without any problem. but at switching from model to log perspective this problem comes up.Can someone help me about this problem???? Thank you