Simulator Failed to Install Application

Question

I've been working on my app over the past few days and I've always been able to simulate it. Today, I compiled and ran, got no errors or warnings, but on the bottom of XCode there is a message saying

> Error From Debugger: Failed to launch
> simulated application: iOS Simulator
> failed to install application

This is the Internal error window that pops up after trying to "build and go" once again,

File: /SourceCache/IndigoDebuggingPlugin/IndigoDebuggingPlugin-44/iPhoneSimulatorDevice/XCiPhoneSimulatorDevice.m Line: 341 Object: Method: _launchSimulatedExecutable:

Assertion failed: nil == _currentSimulatorSession

I looked for help around the internet and I've tried deleting my build folder manually, cleaning and building, and I've just recently completely reinstalled XCode and the whole SDK.

Also when quitting XCode with this project open, it gives me this in an error message:

Failed to close project

Reason: ASSERTION FAILURE in /SourceCache/iPhoneSimulatorRemoteClient/iPhoneSimulatorRemoteClient-18/Source/DTiPhoneSimulatorSession.m:147 Details: requestEndWithTimeout: called on failed session. Object:
Method: -requestEndWithTimeout: Thread: {name = (null), num = 1} Backtrace: 0 0x00043888 -[DTAssertionHandler handleFailureInMethod:object:fileName:lineNumber:messageFormat:arguments:] (in DevToolsFoundation) 1 0x00043518 _DTAssertionFailureHandler (in DevToolsFoundation) 2 0x1e06f807 -[DTiPhoneSimulatorSession requestEndWithTimeout:] (in iPhoneSimulatorRemoteClient) 3 0x1d8a5ca9 4 0x00826b95 -[PBXDebugSessionModule stopLaunchSession] (in DevToolsInterface) 5 0x008243c8 -[PBXDebugSessionModule closeModule] (in DevToolsInterface) 6 0x9973017d -[NSArray makeObjectsPerformSelector:] (in CoreFoundation) 7 0x0077f6ea -[PBXModule closeModule] (in DevToolsInterface) 8 0x9973017d -[NSArray makeObjectsPerformSelector:] (in CoreFoundation) 9 0x0077f6ea -[PBXModule closeModule] (in DevToolsInterface) 10 0x9973017d -[NSArray makeObjectsPerformSelector:] (in CoreFoundation) 11 0x0099a188 -[XCPerspectivesSpecification closeAllModules] (in DevToolsInterface) 12 0x9973017d -[NSArray makeObjectsPerformSelector:] (in CoreFoundation) 13 0x0076468e -[PBXProjectDocument mainModuleShouldClose:] (in DevToolsInterface) 14 0x00998bf6 -[XCPerspectiveModule windowShouldClose:] (in DevToolsInterface) 15 0x000099a1 16 0x00007297 17 0x95b8d522 -[NSApplication _docController:shouldTerminate:] (in AppKit) 18 0x95b8d048 -[NSDocumentController(NSInternal) _continueTerminationHavingClosedAllDocuments:context:] (in AppKit) 19 0x95b8ce26 -[NSDocumentController(NSInternal) _shouldTerminateWithDelegate:shouldTerminateSelector:] (in AppKit) 20 0x95b8c6ff -[NSApplication _shouldTerminate] (in AppKit) 21 0x95b8c271 -[NSApplication te

I have no idea what to do next, any help would be appreciated.

Answer 1

I was encountering this when trying to test my app in the simulator. Xcode 5, app is for iOS 5.1 up through current iOS 7.0.2 -- Xcode could build and run on the iOS 7 simulator, but would fail to install the app on the iOS 6.1 simulator. My steps to fix this were

1. Search stackoverflow and read all the comments on this question;
2. Have the iOS Simulator show the system log and watch the log when Xcode tried to build and run on the iOS 6.1 simulator;
3. Notice this important message in the log: installd[1106]: 0xb0115000 delta_copy: Problem copying package delta
4. Go to iOS Simulator and delete the iOS 7 version of the app from the "device" (long press on app icon followed by clicking on the (X) removal tab),
5. Build and run successfully with the simulator.