Mail.app crashed at launch: [MFIMAPAccount deferredInitializationQueue]

Originator:mc
Number:rdar://22492668 Date Originated:2015-08-30
Status:Open Resolved:
Product:OS X Product Version:10.11 Beta (15A263e)
Classification:Crash/Hang/Data Loss Reproducible:Always
 
All went fine for a day or so after I installed El Capitan. Then I added a second Google Account, all went fine again, then I did something with changing an alias (I'm totally not sure what) and the next time I wanted to launch, this... 

(Adding .crash to #rdar)

Crashed Thread:        9  Dispatch queue: [MFIMAPAccount deferredInitializationQueue] :: NSOperation 0x7fb1eb465250 (QOS: BACKGROUND)

Exception Type:        EXC_CRASH (SIGABRT)
Exception Codes:       0x0000000000000000, 0x0000000000000000
Exception Note:        EXC_CORPSE_NOTIFY

Application Specific Information:
*** Terminating app due to exception while holding database lock 'NSInternalInconsistencyException', reason: 'Cannot set MFGmailLabelStore as data source for message.'
abort() called

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