swift2 - Xcode 7 beta 3 crashes creating core data ns managed subclass or entity -

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having problem xcode 7 crashing when try create core data entity. can create entity , add attributes after crashes... when xcode resumes entity no longer there. error seems reflect in core foundation, not specific, exception.

i've asked in apple dev forums no response.

sometimes can past stage create ns managed subclass files, files appear generated same error, crash, , upon resume entity , subclass files no longer there.

any suggestions appreciated. thank you.


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