NSPersistentDocument: *** Assertion failure in -[NSVBSavePanel viewWillInvalidate:]

in

If you get the following error when saving your new NSPersistentDocument:

2017-09-17 21:14:30.531466+0200 TST_NSPersistentDocument_Override_MC[57707:11669067] *** Assertion failure in -[NSVBSavePanel viewWillInvalidate:], /BuildRoot/Library/Caches/com.apple.xbs/Sources/AppKit/AppKit-1561/Nav.subproj/OpenAndSavePanelRemote/NSVBOpenAndSavePanels.m:387
2017-09-17 21:14:30.543482+0200 TST_NSPersistentDocument_Override_MC[57707:11669067] -[NSVBSavePanel init] caught non-fatal NSInternalInconsistencyException 'bridge absent' with backtrace (
    0   CoreFoundation                      0x00007fff283360fb __exceptionPreprocess + 171
    1   libobjc.A.dylib                     0x00007fff4ebe4c76 objc_exception_throw + 48
    2   CoreFoundation                      0x00007fff2833be92 +[NSException raise:format:arguments:] + 98
    3   Foundation                          0x00007fff2a3d2690 -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 193
    4   AppKit                              0x00007fff25b3ec4e -[NSVBSavePanel viewWillInvalidate:] + 188
    5   ViewBridge                          0x00007fff4c551cb3 -[NSRemoteView invalidate:] + 292
    6   ViewBridge                          0x00007fff4c55f449 -[NSRemoteView _advanceToConfigPhaseLegacy] + 1111
    7   ViewBridge                          0x00007fff4c5602dc -[NSRemoteView _viewServiceMarshalProxy:withDetailedErrorHandler:] + 230
    8   ViewBridge                          0x00007fff4c5606c5 -[NSRemoteView _viewServiceMarshalProxy:withErrorHandler:] + 78
    9   ViewBridge                          0x00007fff4c552755 -[NSRemoteView bridge] + 227
    10  AppKit                              0x00007fff25afa5f6 -[NSVBSavePanel init] + 292
    11  AppKit                              0x00007fff25afa1a1 +[NSSavePanel _crunchyRawUnbonedPanel] + 72
    12  AppKit                              0x00007fff2646c0ba -[NSDocument(NSDocumentSaving) _preparedSavePanelForOperation:] + 263
    13  AppKit                              0x00007fff2646cb1c __104-[NSDocument(NSDocumentSaving) _runModalSavePanelForSaveOperation:delegate:didSaveSelector:contextInfo:]_block_invoke_2 + 317
    14  AppKit                              0x00007fff25c0180a -[NSDocument _commitEditingThenContinue:] + 472
    15  AppKit                              0x00007fff25f97481 __62-[NSPersistentDocument _documentEditor:didCommit:withContext:]_block_invoke + 52
    16  CoreFoundation                      0x00007fff282ce52c __CFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK__ + 12
    17  CoreFoundation                      0x00007fff282b0f43 __CFRunLoopDoBlocks + 275
    18  CoreFoundation                      0x00007fff282b0d08 __CFRunLoopRun + 3128
    19  CoreFoundation                      0x00007fff282afe43 CFRunLoopRunSpecific + 483
    20  HIToolbox                           0x00007fff275cf866 RunCurrentEventLoopInMode + 286
    21  HIToolbox                           0x00007fff275cf5d6 ReceiveNextEventCommon + 613
    22  HIToolbox                           0x00007fff275cf354 _BlockUntilNextEventMatchingListInModeWithFilter + 64
    23  AppKit                              0x00007fff258cd44f _DPSNextEvent + 2085
    24  AppKit                              0x00007fff26062508 -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 3044
    25  AppKit                              0x00007fff258c225d -[NSApplication run] + 764
    26  AppKit                              0x00007fff258913fe NSApplicationMain + 804
    27  TST_NSPersistentDocument_Override_MC 0x000000010000379d main + 13
    28  libdyld.dylib                       0x00007fff4f7d3145 start + 1
    29  ???                                 0x0000000000000003 0x0 + 3
)

This is due to the fact that, by default, Xcode only adds the "Read Only" permission to "User Selected File".

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Change it your Target > Capabilities > App Sandbox settings and rebuild!

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