title: Why does Xcode crash when I open a project?
body: <p>I'm trying to open a project with the latest version of Xcode 5.0.2 (updated today). For some reason, it crashes. I can't open any project, it crashes all times :(
  Crash report begins like this (if helps):</p>
  
  <pre><code>Process:         Xcode [1631]
  Path:            /Applications/Xcode.app/Contents/MacOS/Xcode
  Identifier:      com.apple.dt.Xcode
  Version:         5.0.2 (3335.32)
  Build Info:      IDEApplication-3335032000000000~4
  App Item ID:     497799835
  App External ID: 106632651
  Code Type:       X86-64 (Native)
  Parent Process:  launchd [133]
  Responsible:     Xcode [1631]
  User ID:         501
  
  Date/Time:       2013-11-12 18:14:14.782 +0100
  OS Version:      Mac OS X 10.9 (13A603)
  Report Version:  11
  Anonymous UUID:  041E96A2-1123-3287-3FF6-A3F30382FC69
  
  Sleep/Wake UUID: C6807823-3147-4602-B01F-A2A9E80B8259
  
  Crashed Thread:  0  Dispatch queue: com.apple.main-thread
  
  Exception Type:  EXC_CRASH (SIGABRT)
  Exception Codes: 0x0000000000000000, 0x0000000000000000
  
  Application Specific Information:
  ProductBuildVersion: 5A3005
  ASSERTION FAILURE in /SourceCache/DVTFoundation/DVTFoundation-3542/Framework/Classes/FileTypes/DVTFileDataType.m:616
  Details:  stringRep should be a non-empty string, but it is nil
  Object:   &lt;DVTFileDataType&gt;
  Method:   +fileDataTypeFromStringRepresentation:
  Thread:   &lt;NSThread: 0x7fc7d9d151c0&gt;{name = (null), num = 1}
  Hints:   None
  Backtrace:
    0  0x0000000102e69ea8 -[IDEAssertionHandler handleFailureInMethod:object:fileName:lineNumber:messageFormat:arguments:] (in IDEKit)
    1  0x0000000101bf17a5 _DVTAssertionHandler (in DVTFoundation)
    2  0x0000000101bf1ad4 _DVTAssertionFailureHandler (in DVTFoundation)
    3  0x0000000101b8ca94 +[DVTFileDataType fileDataTypeFromStringRepresentation:] (in DVTFoundation)
    4  0x0000000107fa5dd0 -[Xcode3TargetProduct fileDataType] (in DevToolsCore)
    5  0x00000001025f25ce -[IDEBuildableProductRunnable runnableUTIType:] (in IDEFoundation)
    6  0x00000001025ee340 -[IDEProfileSchemeAction _updateAnalysisToolService] (in IDEFoundation)
    7  0x0000000101c02bc8 __73-[DVTObservingBlockToken observeValueForKeyPath:ofObject:change:context:]_block_invoke (in DVTFoundation)
    8  0x0000000101c19e88 DVTInvokeWithStrongOwnership (in DVTFoundation)
    9  0x0000000101b58479 -[DVTObservingBlockToken observeValueForKeyPath:ofObject:change:context:] (in DVTFoundation)
   10  0x00007fff90c4bc18 NSKeyValueNotifyObserver (in Foundation)
   11  0x00007fff90c4ade8 NSKeyValueDidChange (in Foundation)
   12  0x00007fff90c4fa56 -[NSObject(NSKeyValueObserverNotification) didChangeValueForKey:] (in Foundation)
   13  0x0000000102f6b395 -[IDEContextAutocreationController addBuildable:toScheme:] (in IDEKit)
   14  0x0000000102f6bd68 -[IDEContextAutocreationController createSchemeForBuildable:withName:] (in IDEKit)
   15  0x0000000102f6b16d -[IDEContextAutocreationController createDefaultSchemeForBuildable:] (in IDEKit)
   16  0x0000000102cf2976 -[IDEContextAutocreationController autocreateSchemesForcingAutocreate:] (in IDEKit)
   17  0x0000000101c03618 -[NSObject(DVTObservingConvenience) _dvt_newObserverForKeyPath:options:owner:withHandlerBlock:] (in DVTFoundation)
   18  0x0000000101b57fc5 -[NSObject(DVTObservingConvenience) dvt_newObserverForKeyPath:options:owner:withHandlerBlock:] (in DVTFoundation)
   19  0x0000000101c0326c -[NSObject(DVTObservingConvenience) dvt_addObserverForKeyPath:options:owner:withHandlerBlock:] (in DVTFoundation)
   20  0x0000000102f6a11e __53-[IDEContextAutocreationController initForWorkspace:]_block_invoke_2 (in IDEKit)
   21  0x0000000101c03618 -[NSObject(DVTObservingConvenience) _dvt_newObserverForKeyPath:options:owner:withHandlerBlock:] (in DVTFoundation)
   22  0x0000000101b57fc5 -[NSObject(DVTObservingConvenience) dvt_newObserverForKeyPath:options:owner:withHandlerBlock:] (in DVTFoundation)
   23  0x0000000101c0326c -[NSObject(DVTObservingConvenience) dvt_addObserverForKeyPath:options:owner:withHandlerBlock:] (in DVTFoundation)
   24  0x0000000102f69e8b __53-[IDEContextAutocreationController initForWorkspace:]_block_invoke (in IDEKit)
   25  0x0000000101c02bc8 __73-[DVTObservingBlockToken observeValueForKeyPath:ofObject:change:context:]_block_invoke (in DVTFoundation)
   26  0x0000000101c19e88 DVTInvokeWithStrongOwnership (in DVTFoundation)
   27  0x0000000101b58479 -[DVTObservingBlockToken observeValueForKeyPath:ofObject:change:context:] (in DVTFoundation)
   28  0x00007fff90c4bc18 NSKeyValueNotifyObserver (in Foundation)
   29  0x00007fff90c4ade8 NSKeyValueDidChange (in Foundation)
   30  0x00007fff90c4fa56 -[NSObject(NSKeyValueObserverNotification) didChangeValueForKey:] (in Foundation)
   31  0x000000010268481a __81-[IDEWorkspace _finishLoadingAsynchronously:shouldUpgradeFromSimpleFilesFocused:]_block_invoke (in IDEFoundation)
   32  0x0000000102684ac1 __81-[IDEWorkspace _finishLoadingAsynchronously:shouldUpgradeFromSimpleFilesFocused:]_block_invoke281 (in IDEFoundation)
   33  0x00007fff90c6b055 -[NSBlockOperation main] (in Foundation)
   34  0x00007fff90c4a591 -[__NSOperationInternal _start:] (in Foundation)
   35  0x00007fff90c4a23b __NSOQSchedule_f (in Foundation)
   36  0x00007fff852dc2ad _dispatch_client_callout (in libdispatch.dylib)
   37  0x00007fff852e3f03 _dispatch_main_queue_callback_4CF (in libdispatch.dylib)
   38  0x00007fff859b9839 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ (in CoreFoundation)
   39  0x00007fff85974b14 __CFRunLoopRun (in CoreFoundation)
   40  0x00007fff85974275 CFRunLoopRunSpecific (in CoreFoundation)
   41  0x00007fff8bc2ef0d RunCurrentEventLoopInMode (in HIToolbox)
   42  0x00007fff8bc2ecb7 ReceiveNextEventCommon (in HIToolbox)
   43  0x00007fff8bc2eabc _BlockUntilNextEventMatchingListInModeWithFilter (in HIToolbox)
   44  0x00007fff8b0af28e _DPSNextEvent (in AppKit)
   45  0x00007fff8b0ae8db -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] (in AppKit)
   46  0x00007fff8b0a29cc -[NSApplication run] (in AppKit)
   47  0x00007fff8b08d803 NSApplicationMain (in AppKit)
   48  0x00007fff899005fd start (in libdyld.dylib)
  </code></pre>