title: Failed to launch simulated application: Unknown error
body: <ul>
  <li>OS X 10.5.7 (genuine Mac)</li>
  <li>Xcode 3.1.3</li>
  <li>iPhone SDK 3.0</li>
  </ul>
  
  <p>When I try to execute my iPhone application in simulator, I get the dreaded error message:</p>
  
  <pre>
  Failed to launch simulated application: Unknown error.
  </pre>
  
  <p>My application has two targets, but this error occurs on both of them. </p>
  
  <p>When error occurs, the simulated OS hangs &mdash; it displays black screen and no longer responds on any input. Simulator application itself does not hang &mdash; all menus are active.</p>
  
  <p>All other applications I've tried running (mostly Apple samples) do work fine. Purging of caches, rebooting and howling on the Moon did not helped. Rebuilding project from scratch did not helped either. I guess I have to do it again in smaller steps.</p>
  
  <p>Meanwhile, are there any other things to try than these below?</p>
  
  <ul>
  <li>Xcode | Empty Caches...</li>
  <li>Delete directory /Library/Caches/com.apple.DeveloperTools.###</li>
  <li>Full rebuild</li>
  <li>Reboot</li>
  <li>Change the product name (it did not contain any spaces anyway)</li>
  <li>Create new project and configure it manually from scratch</li>
  </ul>
  
  <p>A quote from the system.log:</p>
  
  <pre>
  12.08.09 0:13:59 [0x0-0xa70a7].com.apple.iphonesimulator[5368] -[MonitorController forwardEvents]: unable to send msg to ffffffff: 10000003 
  12.08.09 0:13:59 [0x0-0xa70a7].com.apple.iphonesimulator[5368] -[MonitorController forwardEvents]: unable to send msg to ffffffff: 10000003 
  12.08.09 0:14:03 com.apple.launchd[166] (com.apple.iPhoneSimulator:com.apple.dataaccess.dataaccessd) Unknown key for integer: JetsamPriority 
  12.08.09 0:14:03 com.apple.launchd[166] (com.apple.iPhoneSimulator:com.apple.apsd) Path monitoring failed on "/var/mobile/Library/Preferences": No such file or directory 
  12.08.09 0:14:03 com.apple.launchd[166] (com.apple.iPhoneSimulator:com.apple.dataaccess.dataaccessd) Path monitoring failed on "/var/mobile/Library/Preferences": No such file or directory 
  12.08.09 0:14:03 vot[9750] ******** AX INSPECTOR MODE ************ 
  12.08.09 0:14:03 vot[9750] VoiceOverTouch exiting because accessibility is not enabled. To enable do this: 'defaults write com.apple.Accessibility AccessibilityEnabled true' 
  12.08.09 0:14:03 Xcode[9079] Error launching simulated application: Error Domain=DTiPhoneSimulatorErrorDomain Code=1 UserInfo=0x39251e0 "Unknown error."
  </pre>
  
  <p>Note that something called <code>VoiceOverTouch</code> is mentioned in the log. My application does not contain (to the best of my knowledge) anything related to accessibility (could be brought in by some dependency though). I've enabled accessibility on my Mac as suggested in error message, but it did not helped. I've enabled Accessibility Inspector in the iPhone simulator. VoiceOverTouch message no longer appears in logs, but the Unknown error persists.</p>
  
  <p>New logs:</p>
  
  <pre>
  12.08.09 11:01:20 com.apple.launchd[166] (com.apple.iPhoneSimulator:com.apple.AXInspector[10808]) Exited: Terminated 
  12.08.09 11:01:28 com.apple.launchd[166] (com.apple.iPhoneSimulator:com.apple.dataaccess.dataaccessd) Unknown key for integer: JetsamPriority 
  12.08.09 11:01:28 com.apple.launchd[166] (com.apple.iPhoneSimulator:com.apple.apsd) Path monitoring failed on "/var/mobile/Library/Preferences": No such file or directory 
  12.08.09 11:01:28 com.apple.launchd[166] (com.apple.iPhoneSimulator:com.apple.dataaccess.dataaccessd) Path monitoring failed on "/var/mobile/Library/Preferences": No such file or directory 
  12.08.09 11:01:28 vot[10812] ******** AX INSPECTOR MODE ************ 
  12.08.09 11:01:28 Xcode[10200] Xcode(10200,0xb0103000) malloc: free_garbage: garbage ptr = 0x2e9b930, has non-zero refcount = 1 
  12.08.09 11:01:28 Xcode[10200] Xcode(10200,0xb0103000) malloc: free_garbage: garbage ptr = 0x495e240, has non-zero refcount = 1 
  12.08.09 11:01:28 [0x0-0xbf0bf].com.apple.Xcode[10200] Xcode(10200,0xb0103000) malloc: free_garbage: garbage ptr = 0x2e9b930, has non-zero refcount = 1 
  12.08.09 11:01:28 [0x0-0xbf0bf].com.apple.Xcode[10200] Xcode(10200,0xb0103000) malloc: free_garbage: garbage ptr = 0x495e240, has non-zero refcount = 1 
  12.08.09 11:01:28 Xcode[10200] Error launching simulated application: Error Domain=DTiPhoneSimulatorErrorDomain Code=1 UserInfo=0x49b0060 "Unknown error." 
  12.08.09 11:01:29 Xcode[10200] Xcode(10200,0xb0103000) malloc: free_garbage: garbage ptr = 0x44e4ba0, has non-zero refcount = 1 
  12.08.09 11:01:29 Xcode[10200] Xcode(10200,0xb0103000) malloc: free_garbage: garbage ptr = 0x4537820, has non-zero refcount = 1 
  12.08.09 11:01:29 [0x0-0xbf0bf].com.apple.Xcode[10200] Xcode(10200,0xb0103000) malloc: free_garbage: garbage ptr = 0x44e4ba0, has non-zero refcount = 1 
  12.08.09 11:01:29 [0x0-0xbf0bf].com.apple.Xcode[10200] Xcode(10200,0xb0103000) malloc: free_garbage: garbage ptr = 0x4537820, has non-zero refcount = 1 
  12.08.09 11:01:29 Xcode[10200] Xcode(10200,0xb0103000) malloc: free_garbage: garbage ptr = 0x4775400, has non-zero refcount = 1 
  12.08.09 11:01:29 Xcode[10200] Xcode(10200,0xb0103000) malloc: free_garbage: garbage ptr = 0x478fa20, has non-zero refcount = 1 
  12.08.09 11:01:29 [0x0-0xbf0bf].com.apple.Xcode[10200] Xcode(10200,0xb0103000) malloc: free_garbage: garbage ptr = 0x4775400, has non-zero refcount = 1 
  12.08.09 11:01:29 [0x0-0xbf0bf].com.apple.Xcode[10200] Xcode(10200,0xb0103000) malloc: free_garbage: garbage ptr = 0x478fa20, has non-zero refcount = 1 
  </pre>