Hi I am having a similar problem, can you help me?
Here is part of what i am getting:
Process: Mail [436]
Path: /Applications/Mail.app/Contents/MacOS/Mail
Identifier: com.apple.mail
Version: 8.2 (2070.6)
Build Info: Mail-2070006000000000~1
Code Type: X86-64 (Native)
Parent Process: ??? [1]
Responsible: Mail [436]
User ID: 503
Date/Time: 2015-03-27 12:35:59.665 -0400
OS Version: Mac OS X 10.10.2 (14C109)
Report Version: 11
Anonymous UUID: 2B320088-4FD8-BA2F-6820-83B0D6943974
Time Awake Since Boot: 160 seconds
Crashed Thread: 14 Dispatch queue: NSOperationQueue 0x600000420a80 :: NSOperation 0x6000006432a0 (QOS: USER_INITIATED)
Exception Type: EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Application Specific Information:
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '+entityForName: nil is not a legal NSPersistentStoreCoordinator for searching for entity name 'Action''
abort() called
terminating with uncaught exception of type NSException
Application Specific Backtrace 1:
0 CoreFoundation 0x00007fff8414066c __exceptionPreprocess + 172
1 libobjc.A.dylib 0x00007fff8f4dc76e objc_exception_throw + 43
2 CoreData 0x00007fff91f5f6a7 +[NSEntityDescription entityForName:inManagedObjectContext:] + 263
3 CoreData 0x00007fff91f60cc9 -[NSFetchRequest(_NSInternalMethods) _resolveEntityWithContext:] + 73
4 CoreData 0x00007fff91f5fa39 -[NSManagedObjectContext executeFetchRequest:error:] + 153
5 MailService 0x00007fff851e83a2 __47-[MSExternalUpdatesManager processLocalActions]_block_invoke + 352
6 Foundation 0x00007fff881490d8 __NSBLOCKOPERATION_IS_CALLING_OUT_TO_A_BLOCK__ + 7
7 Foundation 0x00007fff88035695 -[NSBlockOperation main] + 97
8 Foundation 0x00007fff8801432c -[__NSOperationInternal _start:] + 653
9 Foundation 0x00007fff88013f33 __NSOQSchedule_f + 184
10 libdispatch.dylib 0x00007fff8fab7c13 _dispatch_client_callout + 8
11 libdispatch.dylib 0x00007fff8fabb365 _dispatch_queue_drain + 1100
12 libdispatch.dylib 0x00007fff8fabcecc _dispatch_queue_invoke + 202
13 libdispatch.dylib 0x00007fff8faba6b7 _dispatch_root_queue_drain + 463
14 libdispatch.dylib 0x00007fff8fac8fe4 _dispatch_worker_thread3 + 91
15 libsystem_pthread.dylib 0x00007fff8e265637 _pthread_wqthread + 729
16 libsystem_pthread.dylib 0x00007fff8e26340d start_wqthread + 13
Thread 0:: Dispatch queue: com.apple.main-thread
0 libsystem_kernel.dylib 0x00007fff82f0c51a semaphore_wait_trap + 10
1 libdispatch.dylib 0x00007fff8fabec55 _dispatch_semaphore_wait_slow + 213
2 libxpc.dylib 0x00007fff909a17d1 xpc_connection_send_message_with_reply_sync + 200
3 com.apple.LaunchServices 0x00007fff857b1380 _LSSetApplicationInformation + 275
4 com.apple.LaunchServices 0x00007fff857bc378 _LSSetApplicationInformationItem + 98
5 com.apple.mail 0x00000001004e9a8b 0x10043e000 + 703115
6 com.apple.Foundation 0x00007fff88071cdc __NSThreadPerformPerform + 293
7 com.apple.CoreFoundation 0x00007fff8405e681 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
8 com.apple.CoreFoundation 0x00007fff8405080d __CFRunLoopDoSources0 + 269
9 com.apple.CoreFoundation 0x00007fff8404fe3f __CFRunLoopRun + 927
10 com.apple.CoreFoundation 0x00007fff8404f858 CFRunLoopRunSpecific + 296
11 com.apple.HIToolbox 0x00007fff8dbacaef RunCurrentEventLoopInMode + 235
12 com.apple.HIToolbox 0x00007fff8dbac86a ReceiveNextEventCommon + 431
13 com.apple.HIToolbox 0x00007fff8dbac6ab _BlockUntilNextEventMatchingListInModeWithFilter + 71
14 com.apple.AppKit 0x00007fff8ba2bf81 _DPSNextEvent + 964
15 com.apple.AppKit 0x00007fff8ba2b730 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 194
16 com.apple.AppKit 0x00007fff8ba1f593 -[NSApplication run] + 594
17 com.apple.AppKit 0x00007fff8ba0aa14 NSApplicationMain + 1832
18 libdyld.dylib 0x00007fff8907c5c9 start + 1