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[protege-discussion] could not activate SWRLTab: java.lang.Nullpointerexception

zhang weishan dr_zhangws at
Wed Sep 5 12:59:38 PDT 2007

Dear all,
  It seems that that the SWRLTab could not be activated with a big OWL ontology or imports several ontologies that forms a big one. 
Got this error even after checking that the ontology is consistent. 'could not activate SWRLTab: java.lang.Nullpointerexception'.  This happened also if there are 'equivalentClass' for my ontology.
  Any way around or solutions? 

  Best regards,

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