Mail crashes when trying to open Time Machine since upgrade to Catalina

When attempting to open Time Machine for my primary email address, Mail closes and provides an error message. My iMac has the public version of Catalina installed. Time Machine works fine with lesser used email addresses and when looking for something via Finder. I get the following error message (I've only included the applicable part). Thanks for your insights!

System Integrity Protection: enabled

Crashed Thread: 0 Dispatch queue: NSManagedObjectContext 0x600000aeabc0

Exception Type: EXC_CRASH (SIGABRT)

Exception Codes: 0x0000000000000000, 0x0000000000000000

Exception Note: EXC_CORPSE_NOTIFY

Application Specific Information:

dyld3 mode

*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Unexpected number of persistent stores (0), expected 1'

Error Domain=NSCocoaErrorDomain Code=256 "The file “Accounts.1063.db.timemachine” couldn’t be opened." UserInfo={NSFilePath=/var/folders/sz/jsgqcvq90nqcm7dnrxvq01m00000gq/T/com.apple.mail/Accounts.1063.db.timemachine, NSSQLiteErrorDomain=14}

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terminating with uncaught exception of type NSException

abort() called