Xcode Crash on StartUp

Question

Since yesterday my xcode crashs every single time i start it. i really dont know whats the problem.
ASSERTION FAILURE in /SourceCache/IDELogNavigator/IDELogNavigator-814/IDELogNavigator.m:582
Details:  (self.rootNavigableItem) should not be nil.
Object:   <IDELogNavigator: 0x40278c360>
Method:   -revertStateWithDictionary:
Thread:   <NSThread: 0x40010a260>{name = (null), num = 1}
Hints:  
  0: Replacement view is installing: <IDELogNavigator: 0x40278c360 representing: <DVTExtension 0x400efcda0: Log Navigator (Xcode.IDEKit.Navigator.Logs) v0.1>>
Backtrace:
  0  0x0000000109f1a466 -[IDEAssertionHandler handleFailureInMethod:object:fileName:lineNumber:messageFormat:arguments:] (in IDEKit)
  1  0x0000000109589794 _DVTAssertionFailureHandler (in DVTFoundation)
  2  0x000000010e038cb1 -[IDELogNavigator revertStateWithDictionary:] (in IDELogNavigator)
  3  0x000000010954c42b -[DVTStateToken _pullStateFromDictionary:] (in DVTFoundation)
  4  0x000000010954c1e2 -[DVTStateToken pullStateFromRepository] (in DVTFoundation)
  5  0x0000000109e6549d -[IDENavigatorArea replacementView:didInstallViewController:] (in IDEKit)
  6  0x00000001097445f1 __42-[DVTReplacementView _setupViewController]_block_invoke_0 (in DVTKit)
  7  0x000000010954d51e DVTInvokeWithFailureHint (in DVTFoundation)
  8  0x0000000109744473 -[DVTReplacementView _setupViewController] (in DVTKit)
  9  0x0000000109744345 -[DVTReplacementView installedViewController] (in DVTKit)
10  0x000000010974f43c -[DVTReplacementView layoutTopDown] (in DVTKit)
11  0x000000010973f1c3 __84+[DVTAutoLayoutView _recursivelyLayoutSubviewsOfView:populatingSetWithLaidOutViews:]_block_invoke_0 (in DVTKit)
12  0x000000010973f272 __84+[DVTAutoLayoutView _recursivelyLayoutSubviewsOfView:populatingSetWithLaidOutViews:]_block_invoke_0 (in DVTKit)
13  0x000000010973f272 __84+[DVTAutoLayoutView _recursivelyLayoutSubviewsOfView:populatingSetWithLaidOutViews:]_block_invoke_0 (in DVTKit)
14  0x000000010973f272 __84+[DVTAutoLayoutView _recursivelyLayoutSubviewsOfView:populatingSetWithLaidOutViews:]_block_invoke_0 (in DVTKit)
15  0x000000010973f272 __84+[DVTAutoLayoutView _recursivelyLayoutSubviewsOfView:populatingSetWithLaidOutViews:]_block_invoke_0 (in DVTKit)
16  0x000000010973f272 __84+[DVTAutoLayoutView _recursivelyLayoutSubviewsOfView:populatingSetWithLaidOutViews:]_block_invoke_0 (in DVTKit)
17  0x000000010973f272 __84+[DVTAutoLayoutView _recursivelyLayoutSubviewsOfView:populatingSetWithLaidOutViews:]_block_invoke_0 (in DVTKit)
18  0x000000010973f272 __84+[DVTAutoLayoutView _recursivelyLayoutSubviewsOfView:populatingSetWithLaidOutViews:]_block_invoke_0 (in DVTKit)
19  0x000000010973f272 __84+[DVTAutoLayoutView _recursivelyLayoutSubviewsOfView:populatingSetWithLaidOutViews:]_block_invoke_0 (in DVTKit)
20  0x000000010973f272 __84+[DVTAutoLayoutView _recursivelyLayoutSubviewsOfView:populatingSetWithLaidOutViews:]_block_invoke_0 (in DVTKit)
21  0x000000010973f037 +[DVTAutoLayoutView _recursivelyLayoutSubviewsOfView:populatingSetWithLaidOutViews:] (in DVTKit)
22  0x000000010974f028 -[DVTDelayedValidator doValidation:] (in DVTKit)
23  0x00007fff93705804 __NSFirePerformWithOrder (in Foundation)
24  0x00007fff89c99647 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ (in CoreFoundation)
25  0x00007fff89c995a6 __CFRunLoopDoObservers (in CoreFoundation)
26  0x00007fff89c6e889 __CFRunLoopRun (in CoreFoundation)
27  0x00007fff89c6e216 CFRunLoopRunSpecific (in CoreFoundation)
28  0x00007fff92a504ff RunCurrentEventLoopInMode (in HIToolbox)
29  0x00007fff92a57c21 ReceiveNextEventCommon (in HIToolbox)
30  0x00007fff92a57aae BlockUntilNextEventMatchingListInMode (in HIToolbox)
31  0x00007fff94a60191 _DPSNextEvent (in AppKit)
32  0x00007fff94a5fa95 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] (in AppKit)
33  0x00007fff94a5c3d6 -[NSApplication run] (in AppKit)
34  0x00007fff94cda52a NSApplicationMain (in AppKit)
35  0x000000010951aeec (in Xcode)
External Modification Summary:
  Calls made by other processes targeting this process:
    task_for_pid: 6
    thread_create: 0
    thread_set_state: 0
  Calls made by this process:
    task_for_pid: 0
    thread_create: 0
    thread_set_state: 0
  Calls made by all processes on this machine:
    task_for_pid: 1268
    thread_create: 1
    thread_set_state: 0
VM Region Summary:
ReadOnly portion of Libraries: Total=280.5M resident=173.9M(62%) swapped_out_or_unallocated=106.6M(38%)
Writable regions: Total=16.2G written=38.9M(0%) resident=129.9M(1%) swapped_out=0K(0%) unallocated=16.0G(99%)
REGION TYPE                      VIRTUAL
===========                      =======
CG backing stores                  13.5M
CG image                            324K
CG raster data                     2720K
CG shared images                   3416K
CoreAnimation                       344K
CoreGraphics                         16K
CoreImage                            88K
CoreServices                       1772K
IOKit                              9220K
MALLOC                            361.5M
MALLOC (reserved)                  15.8G        reserved VM address space (unallocated)
MALLOC guard page                    64K
Memory tag=240                        4K
Memory tag=242                       12K
Memory tag=243                        4K
Memory tag=249                      156K
Memory tag=251                       76K
OpenCL                               44K
OpenGL GLSL                        1372K
OpenGL GLSL (reserved)              128K        reserved VM address space (unallocated)
SQLite page cache                   960K
STACK GUARD                        56.1M
Stack                              14.2M
VM_ALLOCATE                        18.4M
__CI_BITMAP                          80K
__DATA                             30.2M
__IMAGE                            1256K
__LINKEDIT                         68.9M
__TEXT                            211.5M
__UNICODE                           544K
mapped file                        41.0M
shared memory                      11.0M
===========                      =======
TOTAL                              16.6G
TOTAL, minus reserved VM space    848.3M
Model: MacBookPro8,1, BootROM MBP81.0047.B0E, 2 processors, Intel Core i5, 2.3 GHz, 4 GB, SMC 1.68f96
Graphics: Intel HD Graphics 3000, Intel HD Graphics 3000, Built-In, 384 MB
Memory Module: BANK 0/DIMM0, 2 GB, DDR3, 1333 MHz, 0x80CE, 0x4D34373142353737334448302D4348392020
Memory Module: BANK 1/DIMM0, 2 GB, DDR3, 1333 MHz, 0x80CE, 0x4D34373142353737334448302D4348392020
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0xD6), Broadcom BCM43xx 1.0 (5.100.98.75.6)
Bluetooth: Version 2.5.0f17, 2 service, 19 devices, 1 incoming serial ports
Network Service: Wi-Fi, AirPort, en1
Serial ATA Device: TOSHIBA MK3265GSXF, 320,07 GB
Serial ATA Device: MATSHITADVD-R   UJ-8A8
USB Device: hub_device, 0x0424  (SMSC), 0x2513, 0xfa100000 / 3
USB Device: BRCM2070 Hub, 0x0a5c  (Broadcom Corp.), 0x4500, 0xfa110000 / 5
USB Device: Bluetooth USB Host Controller, apple_vendor_id, 0x821a, 0xfa113000 / 8
USB Device: Apple Internal Keyboard / Trackpad, apple_vendor_id, 0x0253, 0xfa120000 / 4
USB Device: FaceTime HD Camera (Built-in), apple_vendor_id, 0x8509, 0xfa200000 / 2
USB Device: hub_device, 0x0424  (SMSC), 0x2513, 0xfd100000 / 2
USB Device: IR Receiver, apple_vendor_id, 0x8242, 0xfd110000 / 3
In other threads they mentioned to delete the cache? is there someone who could explain it step by step for noobies
many of the folders and files i should delete and restart arent even there?! re-installed xcode twice now, didnt work. same problem, crash on start up.
starts to **** me off...
thx 4 help

Answer 1

Hi,
I could solve this problem. Hope it works for your case, too.
In my case, every time I open Xcode 4.2, a pop up appeared saying Xcode has problem with 3 buttons, Show Details, Continue, Crash. And I used to press "Crash" or "Show Details" after trying "Continue" 2 or 3 times.
But today, I tried pressing "Continue" 7 times, and then Xcode window appeared finally. There, I created new project from top menu and saved, then the same pop up appeared and I pressed "Continue" 3 times and closed. Since then, I am able to open Xcode without any problem.
I don't know why this happens, but I think Xcode was referencing wrong file path in its start up. In my case, this issue appeared after Xcode hanged up and I killed the process forcefully and since then initial file might be broken in Xcode.
And I'm not sure how many times we should press "Continue" button in each case and it may be different in each case, but hope it works for your case, too.