Xcode crashes when trying to run project due to LLDB

Question

When I click 'Run', Xcode crashes instantly, regardless of my code. The crash report says that the LLDB plugin can not be read correctly:

Error getting value for key 'workerClass' of extension 'Xcode.DebuggerFoundation.Debugger.LLDB' in plug-in 'com.apple.dt.dbg.DebuggerLLDB'

The crash report:

Process:         Xcode [2184]
Path:            /Applications/Xcode.app/Contents/MacOS/Xcode
Identifier:      com.apple.dt.Xcode
Version:         5.0.2 (3335.32)
Build Info:      IDEApplication-3335032000000000~4
Code Type:       X86-64 (Native)
Parent Process:  launchd [147]
Responsible:     Xcode [2184]
User ID:         501

Date/Time:       2014-02-26 18:41:28.657 +0100
OS Version:      Mac OS X 10.9.2 (13C64)
Report Version:  11
Anonymous UUID:  B5F54D76-660F-C9CE-0C9C-D0D41BA7332B

Sleep/Wake UUID: 9A19E5A2-14DE-40FF-8993-668257EF9F44

Crashed Thread:  0  Dispatch queue: com.apple.main-thread

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

Application Specific Information:
Sending performRunAction: to <IDERunPauseContinueToolbarButton: 0x7f8494673e80> from <IDERunPauseContinueToolbarButton: 0x7f8494673e80>
ProductBuildVersion: 5A3005
UNCAUGHT EXCEPTION (NSInternalInconsistencyException): Error getting value for key 'workerClass' of extension 'Xcode.DebuggerFoundation.Debugger.LLDB' in plug-in 'com.apple.dt.dbg.DebuggerLLDB'
UserInfo: {
    NSUnderlyingError = "Error Domain=DVTPlugInErrorDomain Code=2 \"Loading a plug-in failed.\" UserInfo=0x7f8496dca9a0 {DVTPlugInIdentifierErrorKey=com.apple.dt.dbg.DebuggerLLDB, DVTPlugInExecutablePathErrorKey=/Applications/Xcode.app/Contents/PlugIns/DebuggerLLDB.ideplugin/Contents/MacOS/DebuggerLLDB, NSLocalizedRecoverySuggestion=The plug-in or one of its prerequisite plug-ins may be missing or damaged and may need to be reinstalled., NSLocalizedDescription=Loading a plug-in failed., NSFilePath=/Applications/Xcode.app/Contents/PlugIns/DebuggerLLDB.ideplugin, NSLocalizedFailureReason=The plug-in \U201ccom.apple.dt.dbg.DebuggerLLDB\U201d at path \U201c/Applications/Xcode.app/Contents/PlugIns/DebuggerLLDB.ideplugin\U201d could not be loaded.  The plug-in or one of its prerequisite plug-ins may be missing or damaged., NSUnderlyingError=0x7f8496dc98f0 \"The bundle \U201cDebuggerLLDB\U201d couldn\U2019t be loaded because it is damaged or missing necessary resources.\"}";
}
Hints: 
  0: Sending performRunAction: to <IDERunPauseContinueToolbarButton: 0x7f8494673e80> from <IDERunPauseContinueToolbarButton: 0x7f8494673e80>
  1: Sending performAction: to <DVTDelayedMenuButtonCell: 0x7f8494674490> from <IDERunPauseContinueToolbarButton: 0x7f8494673e80>
Backtrace:
  0  0x00007fff91211244 __exceptionPreprocess (in CoreFoundation)
  1  0x00000001082ddd73 DVTFailureHintExceptionPreprocessor (in DVTFoundation)
  2  0x00007fff940a2e75 objc_exception_throw (in libobjc.A.dylib)
  3  0x000000010826bcd2 -[DVTExtension valueForKey:] (in DVTFoundation)
  4  0x000000010d3d1109 -[DBGLLDBDebugLocalService operationWorkerWithLaunchSession:error:] (in DebuggerLLDBService)
  5  0x0000000110106e17 -[IDERuniPhoneSimulatorService operationWorkerWithLaunchSession:error:] (in IDEiOSSupportCore)
  6  0x0000000108d38d49 -[IDERunDestination runWorkerForLaunchSession:error:] (in IDEFoundation)
  7  0x0000000108d38a74 -[IDERunDestination runOperationForLaunchSession:error:] (in IDEFoundation)
  8  0x0000000108da0fee -[IDELaunchSchemeAction runOperationForExecutionEnvironment:withBuildOperation:buildParameters:buildableProductDirectories:schemeActionRecord:outError:actionCallbackBlock:] (in IDEFoundation)
  9  0x0000000108d94f5b -[IDEScheme _executionOperationForExecutionEnvironment:build:onlyBuild:buildPurpose:buildCommand:schemeCommand:title:overridingProperties:destination:buildLog:filePath:overridingBuildConfiguration:restorePersistedBuildResults:invocationRecord:overridingTestingSpecifiers:error:actionCallbackBlock:] (in IDEFoundation)

This may happen due to a broken LLDB debugger, which could only be solved by Apple. However, I haven't found many similar problems from others on the internet yet, so this may only happen with my Xcode.

Answer 1

I had the same problem: was not able to run any Xcode projects. Reason was I was playing around on Python and downgraded it to 2.6.8 from 2.7.x. So, I have updated the python to 2.7.8 from older version, No problems so far, Xcode deploys everything very smoothly. Other things that I have tried was even uninstalling the X-code and install again, this didn't help. Very useful page to upgrade your python on macbook : http://wolfpaulus.com/jounal/mac/installing_python_osx/