Exception Name: NSUnknownKeyException Description: [ valueForUndefinedKey:]: this class is not key value coding-compliant for the key _documentEditor. User Info: { NSTargetObjectUserInfoKey = ""; NSUnknownUserInfoKey = "_documentEditor"; } 0 CoreFoundation 0x00007fff8cb947dc __exceptionPreprocess + 172 1 libobjc.A.dylib 0x00007fff9202f052 objc_exception_throw + 48 2 CoreFoundation 0x00007fff8cb94379 -[NSException raise] + 9 3 Foundation 0x00007fff9d8fc2a4 -[NSObject(NSKeyValueCoding) valueForUndefinedKey:] + 226 4 Foundation 0x00007fff9d7cf67c -[NSObject(NSKeyValueCoding) valueForKey:] + 414 5 GPGMail 0x000000011112ba70 -[HeadersEditor_GPGMail MASetMessageIsToBeSigned:] + 48 6 Foundation 0x00007fff9d7dd338 -[NSObject(NSKeyValueObservingPrivate) _changeValueForKey:key:key:usingBlock:] + 1027 7 Foundation 0x00007fff9d83bea3 _NSSetCharValueAndNotify + 268 8 Mail 0x000000010b2fa4e0 Mail + 414944 9 GPGMail 0x0000000111129e42 -[HeadersEditor_GPGMail MAAwakeFromNib] + 61 10 CoreFoundation 0x00007fff8ca94b7f -[NSSet makeObjectsPerformSelector:] + 223 11 AppKit 0x00007fff9ecbb795 -[NSIBObjectData nibInstantiateWithOwner:options:topLevelObjects:] + 1192 12 AppKit 0x00007fff9ee7f0da -[NSNib _instantiateNibWithExternalNameTable:options:] + 677 13 AppKit 0x00007fff9ee7ed2a -[NSNib _instantiateWithOwner:options:topLevelObjects:] + 143 14 AppKit 0x00007fff9ee7e223 -[NSViewController loadView] + 270 15 AppKit 0x00007fff9ee0524f -[NSViewController _loadViewIfRequired] + 75 16 AppKit 0x00007fff9ee051ba -[NSViewController view] + 30 17 Mail 0x000000010b3b76b4 Mail + 1189556 18 Mail 0x000000010b3a165d Mail + 1099357 19 Mail 0x000000010b39dc33 Mail + 1084467 20 Mail 0x000000010b3a12c0 Mail + 1098432 21 Foundation 0x00007fff9d7ff8dd __NSBLOCKOPERATION_IS_CALLING_OUT_TO_A_BLOCK__ + 7 22 Foundation 0x00007fff9d7ff64d -[NSBlockOperation main] + 100 23 Foundation 0x00007fff9d7fea33 -[__NSOperationInternal _start:] + 654 24 Foundation 0x00007fff9d7fe51f __NSOQSchedule_f + 194 25 libdispatch.dylib 0x00007fff95b8d409 _dispatch_client_callout + 8 26 libdispatch.dylib 0x00007fff95b9ebd2 _dispatch_main_queue_callback_4CF + 1685 27 CoreFoundation 0x00007fff8cadb5c9 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 9 28 CoreFoundation 0x00007fff8ca9657d __CFRunLoopRun + 1949 29 CoreFoundation 0x00007fff8ca95b78 CFRunLoopRunSpecific + 296 30 HIToolbox 0x00007fff9aee13e5 RunCurrentEventLoopInMode + 235 31 HIToolbox 0x00007fff9aee117b ReceiveNextEventCommon + 432 32 HIToolbox 0x00007fff9aee0fbb _BlockUntilNextEventMatchingListInModeWithFilter + 71 33 AppKit 0x00007fff9ed1bae7 _DPSNextEvent + 1076 34 AppKit 0x00007fff9f0e7ac5 -[NSApplication _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 440 35 AppKit 0x00007fff9ed11986 -[NSApplication run] + 682 36 AppKit 0x00007fff9ec93e9a NSApplicationMain + 1176 37 libdyld.dylib 0x00007fff937b95ad start + 1