Canvas Crash while doing a detail view using Core Data

I keep getting a crash in the Canvas while trying to do a DetailView of some customers from CoreData. Diagnostics button shows this:

MessageSendFailure: Message send failure for update

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|  RemoteHumanReadableError: The operation couldn’t be completed. XPC error received on message reply handler

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|  BSServiceConnectionErrorDomain (3):

|  ==NSLocalizedFailureReason: XPC error received on message reply handler

|  ==BSErrorCodeDescription: OperationFailed

What causes this? is it a Xcode bug... or is it operator error? Thanks for any help... :(

Canvas Crash while doing a detail view using Core Data
 
 
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