Mail crashes instantly on launch

Every time I attempt to open the mail app it immediately crashes and generates an error report. Main error appears to be: "Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Destination of copy isn't an IMAP mailbox'"

The beginning is:

Process: Mail [5364]

Path: /Applications/Mail.app/Contents/MacOS/Mail

Identifier: com.apple.mail

Version: 10.0 (3207.2)

Build Info: Mail-3207002000000000~1

Code Type: X86-64 (Native)

Parent Process: ??? [1]

Responsible: Mail [5364]

User ID: 501

Date/Time: 2016-08-05 07:08:57.101 -0700

OS Version: Mac OS X 10.12 (16A270f)

Report Version: 12

Anonymous UUID: 7AC7E6D5-B657-6FEC-E6F3-F826E53335AE

Sleep/Wake UUID: 16D18B3D-2B29-42B4-B7A2-9A41F35022C2

Time Awake Since Boot: 10000 seconds

Time Since Wake: 1400 seconds

System Integrity Protection: enabled

Crashed Thread: 11 Dispatch queue: IMAPNetworkTaskHandler queue :: NSOperation 0x6080002bc980 (QOS: USER_INITIATED)

Exception Type: EXC_CRASH (SIGABRT)

Exception Codes: 0x0000000000000000, 0x0000000000000000

Exception Note: EXC_CORPSE_NOTIFY

Application Specific Information:

*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Destination of copy isn't an IMAP mailbox'

abort() called

terminating with uncaught exception of type NSException