oops, forgot the stacktrace, here are the first lines: 

Exception Type:        EXC_CRASH (SIGABRT)
Exception Codes:       0x0000000000000000, 0x0000000000000000

Application Specific Information:
ProductBuildVersion: 7C68
ASSERTION FAILURE in 
/Library/Caches/com.apple.xbs/Sources/DVTFrameworks/DVTFrameworks-9542/DVTFoundation/FilePaths/DVTFilePath.m:815
Details:  fsrep is relative ('Prototyper.xcodeproj') parentPath must not be nil 
but it is.
Object:   <DVTFilePath>
Method:   +_filePathForParent:fileSystemRepresentation:length:allowCreation:
Thread:   <NSThread: 0x7ffefb83e300>{number = 1, name = main}
Hints:   None
Backtrace:
  0  0x000000010c7c21fa -[IDEAssertionHandler 
handleFailureInMethod:object:fileName:lineNumber:assertionSignature:messageFormat:arguments:]
 (in IDEKit)
  1  0x000000010b34e761 _DVTAssertionHandler (in DVTFoundation)
  2  0x000000010b34e978 _DVTAssertionFailureHandler (in DVTFoundation)
  3  0x000000010b1258d8 +[DVTFilePath 
_filePathForParent:fileSystemRepresentation:length:allowCreation:] (in 
DVTFoundation)
  4  0x000000010b1254d9 +[DVTFilePath _filePathForParent:pathString:] (in 
DVTFoundation)
  5  0x000000010b125256 +[DVTFilePath filePathForPathString:] (in DVTFoundation)
  6  0x0000000115ade1f0 +[PBXContainer containerForResolvedAbsolutePath:] (in 
DevToolsCore)
  7  0x0000000115a56ae8 -[PBXFileReference loadedContainer] (in DevToolsCore)
  8  0x0000000115b2fdaa -[PBXContainerItemProxy remoteContainer] (in 
DevToolsCore)
  9  0x0000000115b2fe7a -[PBXContainerItemProxy remoteContainerItem] (in 
DevToolsCore)
 10  0x0000000115b32b8e -[PBXReferenceProxy sourceTree] (in DevToolsCore)
 11  0x0000000115a4d35f -[PBXReference addNotifications] (in DevToolsCore)
 12  0x0000000115a53b8d -[PBXReference awakeFromPListUnarchiver:] (in 
DevToolsCore)
 13  0x0000000115b33adf -[PBXReferenceProxy awakeFromPListUnarchiver:] (in 
DevToolsCore)
 14  0x00007fff93987376 -[NSArray makeObjectsPerformSelector:withObject:] (in 
CoreFoundation)
 15  0x0000000115a6436e -[PBXPListUnarchiver decodeRootObject] (in DevToolsCore)
 16  0x0000000115a2e31d +[PBXProject projectWithFile:errorHandler:readOnly:] 
(in DevToolsCore)
 17  0x0000000115c69cab -[Xcode3Project 
initWithFilePath:extension:workspace:options:error:] (in DevToolsCore)
 18  0x000000010c0d9010 __82+[IDEContainer 
_retainedContainerAtFilePath:fileDataType:workspace:options:error:]_block_invoke_2
 (in IDEFoundation)
 19  0x00007fff9948fe73 _dispatch_client_callout (in libdispatch.dylib)
 20  0x00007fff994908ca _dispatch_barrier_sync_f_invoke (in libdispatch.dylib)
 21  0x000000010b38b005 DVTDispatchBarrierSync (in DVTFoundation)
 22  0x000000010b123627 -[DVTDispatchLock performLockedBlock:] (in 
DVTFoundation)
 23  0x000000010c0d89e7 __82+[IDEContainer 
_retainedContainerAtFilePath:fileDataType:workspace:options:error:]_block_invoke
 (in IDEFoundation)
 24  0x000000010b2a9de3 __58-[DVTModelObjectGraph 
performBlockCoalescingModelChanges:]_block_invoke (in DVTFoundation)
 2



> On 22.12.2015, at 11:51, Felix Franz <fr...@ergosign.de> wrote:
> 
> Hi all, 
> 
> I have quiet an old project which worked flawlessly up to Xcode 6.4. Now I 
> tried opening it in Xcode 7.2 and Xcode crashes with the following 
> backtrace[0]. 
> 
> Things I tried so far (in Xcode 6.4):
> - setting the Project Format to “Xcode 6.3-compatible”
> - Editor Validate Settings … 
> - Save as workspace and opening the newly saved workspace…
> 
> All results in exactly the same crash. 
> 
> One strange thing: in the Crash Report "Details:  fsrep is relative 
> ('Prototyper.xcodeproj') parentPath must not be nil but it is.” mentions the 
> name of the project from approx. 4 years ago before we renamed it. 
> 
> Does anyone has a suggestion how to proceed? 
> 
> Cheers, 
> 
> Felix
> 
> 
> _______________________________________________
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> 
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