Hi,

It looks like the XIB file is hosed. If you have a backup it might be time to 
use it. If not, then the only thing I can suggest it to try and open the file 
with an older version of XCode.

Otherwise I think you will need to start again with that XIB as I don’t think 
its an easy job to fix a XIB file.

All the Best
Dave

> On 17 Jun 2016, at 21:26, Chris Tracewell <ch...@thinkcl.com> wrote:
> 
> I have an XCode project that compiles and runs fine but when I edit anything 
> in a particular XIB it crashes XCode. Looking at the error data of the crash 
> it seems to be an Assertion Failure relating to an NSTableHeaderView but I 
> don't understand where to go from there? I am not using auto-layout and this 
> is an OSX app. Below is the crash report. I posted this question to Stack 
> Exchange three days ago but haven't gotten any replies. Thanks in advance.
> 
> 
> Process:               Xcode [2505]
> Path:                  /Applications/Xcode.app/Contents/MacOS/Xcode
> Identifier:            com.apple.dt.Xcode
> Version:               7.3.1 (10188.1)
> Build Info:            IDEFrameworks-10188001000000000~3
> App Item ID:           497799835
> App External ID:       817226719
> Code Type:             X86-64 (Native)
> Parent Process:        ??? [1]
> Responsible:           Xcode [2505]
> User ID:               501
> 
> Date/Time:             2016-06-14 11:30:04.824 -0700
> OS Version:            Mac OS X 10.11.5 (15F34)
> Report Version:        11
> Anonymous UUID:        20048F22-546D-D351-6F8C-D73FF28F4650
> 
> 
> Time Awake Since Boot: 67000 seconds
> 
> System Integrity Protection: enabled
> 
> Crashed Thread:        0  Dispatch queue: com.apple.main-thread
> 
> Exception Type:        EXC_CRASH (SIGABRT)
> Exception Codes:       0x0000000000000000, 0x0000000000000000
> Exception Note:        EXC_CORPSE_NOTIFY
> 
> Application Specific Information:
> ProductBuildVersion: 7D1014
> ASSERTION FAILURE in 
> /Library/Caches/com.apple.xbs/Sources/IDEInterfaceBuilder/IDEInterfaceBuilder-10117/InterfaceBuilderKit/Document/ObjectContainer/IBObjectContainer.m:513
> Details:  Can't get the OID of an object not in the document: 
> <NSTableHeaderView: 0x7fc5daeefd90>
> Object:   <IBObjectContainer: 0x7fc5dae4eeb0>
> Method:   -objectIDForObject:
> Thread:   <NSThread: 0x7fc5d3e17e80>{number = 1, name = main}
> Hints:   None
> Backtrace:
>   0   -[IDEAssertionHandler 
> handleFailureInMethod:object:fileName:lineNumber:assertionSignature:messageFormat:arguments:]
>  (in IDEKit)
>   1   _DVTAssertionHandler (in DVTFoundation)
>   2   _DVTAssertionFailureHandler (in DVTFoundation)
>   3   -[IBObjectContainer objectIDForObject:] (in IDEInterfaceBuilderKit)
>   4   -[IBDocument objectIDForObject:] (in IDEInterfaceBuilderKit)
>   5   -[IBDocument documentArchiver:referenceIDForObject:referenceType:] (in 
> IDEInterfaceBuilderKit)
>   6   -[IBDocumentArchiver referenceIDForObject:withReferenceType:] (in 
> IDEInterfaceBuilderKit)
>   7   -[IBDocumentArchiver archiveObjectReference:referenceType:forKey:] (in 
> IDEInterfaceBuilderKit)
>   8   -[IBDocumentArchiver 
> archiveObjectReference:referenceType:forKey:defaultValue:] (in 
> IDEInterfaceBuilderKit)
>   9   -[NSTableView(IBDocumentArchivingGenerator) 
> archiveWithDocumentArchiver:] (in IDEInterfaceBuilderCocoaIntegration)
>  10   __51-[IBDocumentArchiver archiveObject:forOptionalKey:]_block_invoke 
> (in IDEInterfaceBuilderKit)
>  11   -[IBDocumentArchiver 
> recurseWithElementNamed:forObject:kind:invokingBlock:] (in 
> IDEInterfaceBuilderKit)
>  12   -[IBDocumentArchiver archiveObject:forOptionalKey:] (in 
> IDEInterfaceBuilderKit)
>  13   __59-[IBDocumentArchiver 
> archiveArray:withName:forOptionalKey:]_block_invoke (in 
> IDEInterfaceBuilderKit)
>  14   -[IBDocumentArchiver 
> recurseWithElementNamed:forObject:kind:invokingBlock:] (in 
> IDEInterfaceBuilderKit)
>  15   -[IBDocumentArchiver archiveArray:withName:forOptionalKey:] (in 
> IDEInterfaceBuilderKit)
>  16   -[IBDocumentArchiver 
> archiveArray:withName:forOptionalKey:defaultValue:] (in 
> IDEInterfaceBuilderKit)
>  17   -[NSView(IBViewIntegration) ibArchiveSubviews:] (in 
> IDEInterfaceBuilderKit)
>  18   -[NSView(IBDocumentArchivingGenerator) archiveWithDocumentArchiver:] 
> (in IDEInterfaceBuilderKit)
>  19   -[IBNSCustomView(IBDocumentArchivingGenerator) 
> archiveWithDocumentArchiver:] (in IDEInterfaceBuilderCocoaIntegration)
>  20   __51-[IBDocumentArchiver archiveObject:forOptionalKey:]_block_invoke 
> (in IDEInterfaceBuilderKit)
>  21   -[IBDocumentArchiver 
> recurseWithElementNamed:forObject:kind:invokingBlock:] (in 
> IDEInterfaceBuilderKit)
>  22   -[IBDocumentArchiver archiveObject:forOptionalKey:] (in 
> IDEInterfaceBuilderKit)
>  23   __59-[IBDocumentArchiver 
> archiveArray:withName:forOptionalKey:]_block_invoke (in 
> IDEInterfaceBuilderKit)
>  24   -[IBDocumentArchiver 
> recurseWithElementNamed:forObject:kind:invokingBlock:] (in 
> IDEInterfaceBuilderKit)
>  25   -[IBDocumentArchiver archiveArray:withName:forOptionalKey:] (in 
> IDEInterfaceBuilderKit)
>  26   -[IBDocument archiveTopLevelObjects:] (in IDEInterfaceBuilderKit)
>  27   -[IBDocument archiveAndVerifyArchivingOfTopLevelObjects:] (in 
> IDEInterfaceBuilderKit)
>  28   -[IBDocument archivePlatformIndependentDataWithDocumentArchiver:] (in 
> IDEInterfaceBuilderKit)
>  29   -[IBDocument archiveDocument:] (in IDEInterfaceBuilderKit)
>  30   -[IBDocumentArchiver 
> recurseWithElementNamed:forObject:kind:invokingBlock:] (in 
> IDEInterfaceBuilderKit)
>  31   -[IBDocumentArchiver archiveDocument:withType:compatibilityVersion:] 
> (in IDEInterfaceBuilderKit)
>  32   -[IBDocumentArchiver 
> dataFromArchiveDocument:withType:compatibilityVersion:] (in 
> IDEInterfaceBuilderKit)
>  33   __46-[IBDocument fileWrapperOfType:options:error:]_block_invoke (in 
> IDEInterfaceBuilderKit)
>  34   -[IBDocument fileWrapperOfType:options:error:] (in 
> IDEInterfaceBuilderKit)
>  35   -[IBDocument fileWrapperOfType:error:] (in IDEInterfaceBuilderKit)
>  36   -[NSDocument writeToURL:ofType:error:] (in AppKit)
>  37   -[IBDocument writeToURL:ofType:error:] (in IDEInterfaceBuilderKit)
>  38   -[NSDocument 
> writeToURL:ofType:forSaveOperation:originalContentsURL:error:] (in AppKit)
>  39   -[IBDocument 
> writeToURL:ofType:forSaveOperation:originalContentsURL:error:] (in 
> IDEInterfaceBuilderKit)
>  40   -[NSDocument 
> _writeSafelyToURL:ofType:forSaveOperation:forceTemporaryDirectory:error:] (in 
> AppKit)
>  41   -[NSDocument _writeSafelyToURL:ofType:forSaveOperation:error:] (in 
> AppKit)
>  42   -[NSDocument writeSafelyToURL:ofType:forSaveOperation:error:] (in 
> AppKit)
>  43   -[IDEEditorDocument writeSafelyToURL:ofType:forSaveOperation:error:] 
> (in IDEKit)
>  44   __66-[NSDocument 
> saveToURL:ofType:forSaveOperation:completionHandler:]_block_invoke_22463 (in 
> AppKit)
>  45   __66-[NSDocument 
> saveToURL:ofType:forSaveOperation:completionHandler:]_block_invoke2460 (in 
> AppKit)
>  46   __66-[NSDocument 
> saveToURL:ofType:forSaveOperation:completionHandler:]_block_invoke_22313 (in 
> AppKit)
>  47   __50-[IDEEditorDocument continueFileAccessUsingBlock:]_block_invoke.74 
> (in IDEKit)
>  48   -[NSDocument continueFileAccessUsingBlock:] (in AppKit)
>  49   -[IDEEditorDocument continueFileAccessUsingBlock:] (in IDEKit)
>  50   __101-[NSDocument 
> _fileCoordinator:asynchronouslyCoordinateReadingContentsAndWritingItemAtURL:byAccessor:]_block_invoke_2
>  (in AppKit)
>  51   __68-[IDEEditorDocument 
> continueAsynchronousWorkOnMainThreadUsingBlock:]_block_invoke (in IDEKit)
>  52   __62-[NSDocumentController(NSInternal) 
> _onMainThreadInvokeWorker:]_block_invoke2079 (in AppKit)
>  53   __CFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK__ (in CoreFoundation)
>  54   __CFRunLoopDoBlocks (in CoreFoundation)
>  55   __CFRunLoopRun (in CoreFoundation)
>  56   CFRunLoopRunSpecific (in CoreFoundation)
>  57   RunCurrentEventLoopInMode (in HIToolbox)
>  58   ReceiveNextEventCommon (in HIToolbox)
>  59   _BlockUntilNextEventMatchingListInModeWithFilter (in HIToolbox)
>  60   _DPSNextEvent (in AppKit)
>  61   -[NSApplication _nextEventMatchingEventMask:untilDate:inMode:dequeue:] 
> (in AppKit)
>  62   -[DVTApplication nextEventMatchingMask:untilDate:inMode:dequeue:] (in 
> DVTKit)
>  63   -[NSApplication run] (in AppKit)
>  64   NSApplicationMain (in AppKit)
>  65  0x000000010c51a39b (in Xcode)
>  66   start (in libdyld.dylib)
> 
> abort() called
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