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

Tania Tudorache tudorache at
Thu Sep 6 13:41:41 PDT 2007


Please ask in future OWL related questions on the OWL mailing list.

SWRLTab should also work with large ontologies. If you got an exception 
please sent us the full stack trace from the console, so that we can 
debug this problem.


zhang weishan wrote:
> 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,
>   Weishan
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