App crashes on start on real device only - ios

Question

I wanted to publish my game app today(using Swift - xCode GTM and Sprite kit framework). My app works fine on the simulator but when I tried it on a real device - iPhone 4 iOS 7, it crashes on start:
class func unarchiveFromFile(file : NSString) -> SKNode? {
let path = NSBundle.mainBundle().pathForResource(file, ofType: "sks")//CRASH!
var sceneData = NSData.dataWithContentsOfFile(path!, options: .DataReadingMappedIfSafe, error: nil)
var archiver = NSKeyedUnarchiver(forReadingWithData: sceneData)
archiver.setClass(self.classForKeyedUnarchiver(), forClassName: "SKScene")
let scene = archiver.decodeObjectForKey(NSKeyedArchiveRootObjectKey) as GameScene
archiver.finishDecoding()
return scene
}
}
here is my Crash log:
Exception Type: EXC_BREAKPOINT (SIGTRAP)
Exception Codes: 0x0000000000000001, 0x000000000000defe
Triggered by Thread: 0
Thread 0 Crashed:
0 libswiftCore.dylib 0x003347d0 0x1b6000 + 1566672
1 libswiftCore.dylib 0x001f3a64 0x1b6000 + 252516
2 MyApp 0x000d2904 0xc4000 + 59652
3 MyApp 0x000d36d8 0xc4000 + 63192
4 MyApp 0x000d4214 0xc4000 + 66068
5 MyApp 0x000d4dc4 0xc4000 + 69060
6 UIKit 0x3079e5fe -[UIViewController loadViewIfRequired] + 514
7 UIKit 0x3079e3bc -[UIViewController view] + 20
8 UIKit 0x307a5088 -[UIWindow addRootViewControllerViewIfPossible] + 60
9 UIKit 0x307a275e -[UIWindow _setHidden:forced:] + 302
10 UIKit 0x3080da50 -[UIWindow makeKeyAndVisible] + 56
11 UIKit 0x3080a80c -[UIApplication _callInitializationDelegatesForURL:payload:suspended:] + 1652
12 UIKit 0x30804d0e -[UIApplication _runWithURL:payload:launchOrientation:statusBarStyle:statusBarHidden:] + 710
13 UIKit 0x3079f6a2 -[UIApplication handleEvent:withNewEvent:] + 3126
14 UIKit 0x3079e9a4 -[UIApplication sendEvent:] + 68
15 UIKit 0x308044f8 _UIApplicationHandleEvent + 660
16 GraphicsServices 0x32c3670a _PurpleEventCallback + 606
17 GraphicsServices 0x32c362f2 PurpleEventCallback + 30
18 CoreFoundation 0x2dff39e4 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 32
19 CoreFoundation 0x2dff397e __CFRunLoopDoSource1 + 342
20 CoreFoundation 0x2dff2152 __CFRunLoopRun + 1394
21 CoreFoundation 0x2df5cce2 CFRunLoopRunSpecific + 518
22 CoreFoundation 0x2df5cac6 CFRunLoopRunInMode + 102
23 UIKit 0x30803794 -[UIApplication _run] + 756
24 UIKit 0x307fea3c UIApplicationMain + 1132
25 MyApp 0x000da594 0xc4000 + 91540
26 MyApp 0x000da5d0 0xc4000 + 91600
27 libdyld.dylib 0x38858ab4 start + 0
Thread 1:
0 libsystem_kernel.dylib 0x388fc83c kevent64 + 24
1 libdispatch.dylib 0x38847e08 _dispatch_mgr_invoke + 228
2 libdispatch.dylib 0x388373ee _dispatch_mgr_thread$VARIANT$up + 34
Thread 2:
0 libsystem_kernel.dylib 0x3890fc7c __workq_kernreturn + 8
1 libsystem_pthread.dylib 0x38975dc6 _pthread_wqthread + 306
2 libsystem_pthread.dylib 0x38975c80 start_wqthread + 4
Thread 3:
0 libsystem_kernel.dylib 0x3890fc7c __workq_kernreturn + 8
1 libsystem_pthread.dylib 0x38975dc6 _pthread_wqthread + 306
2 libsystem_pthread.dylib 0x38975c80 start_wqthread + 4
Thread 4 name: WebThread
Thread 4:
0 libsystem_kernel.dylib 0x3890efa8 __psynch_mutexwait + 24
1 libsystem_pthread.dylib 0x38975f0a _pthread_mutex_lock + 302
2 WebCore 0x35e2f138 _WebTryThreadLock(bool) + 104
3 WebCore 0x35e2f0ba WebRunLoopLock(__CFRunLoopObserver*, unsigned long, void*) + 42
4 CoreFoundation 0x2dff41d2 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 18
5 CoreFoundation 0x2dff1b74 __CFRunLoopDoObservers + 280
6 CoreFoundation 0x2dff1f84 __CFRunLoopRun + 932
7 CoreFoundation 0x2df5cce2 CFRunLoopRunSpecific + 518
8 CoreFoundation 0x2df5cac6 CFRunLoopRunInMode + 102
9 WebCore 0x35e2dbae RunWebThread(void*) + 414
10 libsystem_pthread.dylib 0x38977c1a _pthread_body + 138
11 libsystem_pthread.dylib 0x38977b8a _pthread_start + 98
12 libsystem_pthread.dylib 0x38975c8c thread_start + 4
Thread 5 name: com.apple.NSURLConnectionLoader
Thread 5:
0 libsystem_kernel.dylib 0x388fca8c mach_msg_trap + 20
1 libsystem_kernel.dylib 0x388fc888 mach_msg + 44
2 CoreFoundation 0x2dff37c6 __CFRunLoopServiceMachPort + 150
3 CoreFoundation 0x2dff1eec __CFRunLoopRun + 780
4 CoreFoundation 0x2df5cce2 CFRunLoopRunSpecific + 518
5 CoreFoundation 0x2df5cac6 CFRunLoopRunInMode + 102
6 Foundation 0x2e996492 +[NSURLConnection(Loader) _resourceLoadLoop:] + 314
7 Foundation 0x2ea0be22 __NSThread__main__ + 1058
8 libsystem_pthread.dylib 0x38977c1a _pthread_body + 138
9 libsystem_pthread.dylib 0x38977b8a _pthread_start + 98
10 libsystem_pthread.dylib 0x38975c8c thread_start + 4
Thread 6:
0 libsystem_kernel.dylib 0x388fca8c mach_msg_trap + 20
1 libsystem_kernel.dylib 0x388fc888 mach_msg + 44
2 CoreFoundation 0x2dff37c6 __CFRunLoopServiceMachPort + 150
3 CoreFoundation 0x2dff1eec __CFRunLoopRun + 780
4 CoreFoundation 0x2df5cce2 CFRunLoopRunSpecific + 518
5 CoreFoundation 0x2df5cac6 CFRunLoopRunInMode + 102
6 libAVFAudio.dylib 0x2cfe1584 GenericRunLoopThread::Entry(void*) + 124
7 libAVFAudio.dylib 0x2cfd5a94 CAPThread::Entry(CAPThread*) + 176
8 libsystem_pthread.dylib 0x38977c1a _pthread_body + 138
9 libsystem_pthread.dylib 0x38977b8a _pthread_start + 98
10 libsystem_pthread.dylib 0x38975c8c thread_start + 4
Thread 7:
0 libsystem_kernel.dylib 0x3890fc7c __workq_kernreturn + 8
1 libsystem_pthread.dylib 0x38975dc6 _pthread_wqthread + 306
2 libsystem_pthread.dylib 0x38975c80 start_wqthread + 4
Thread 8 name: JavaScriptCore::BlockFree
Thread 8:
0 libsystem_kernel.dylib 0x3890ef38 __psynch_cvwait + 24
1 libsystem_pthread.dylib 0x38977224 _pthread_cond_wait + 536
2 libsystem_pthread.dylib 0x38978040 pthread_cond_timedwait + 40
3 JavaScriptCore 0x2ef80eb8 WTF::ThreadCondition::timedWait(WTF::Mutex&, double) + 104
4 JavaScriptCore 0x2ef80ce4 JSC::BlockAllocator::blockFreeingThreadMain() + 88
5 JavaScriptCore 0x2ef7e3a8 WTF::wtfThreadEntryPoint(void*) + 12
6 libsystem_pthread.dylib 0x38977c1a _pthread_body + 138
7 libsystem_pthread.dylib 0x38977b8a _pthread_start + 98
8 libsystem_pthread.dylib 0x38975c8c thread_start + 4
Thread 0 crashed with ARM Thread State (32-bit):
r0: 0x00000000 r1: 0x00000000 r2: 0x00362ac4 r3: 0x000000b6
r4: 0x00362ac4 r5: 0x00000000 r6: 0x145c97b0 r7: 0x27d3d364
r8: 0x1456eb50 r9: 0x00000fff r10: 0x145c97b0 r11: 0x00362ac0
ip: 0x3a5431d0 sp: 0x27d3d354 lr: 0x00334183 pc: 0x003347d0
cpsr: 0x60000030

Answer 1

The pathForResource() function returns a String?, indicating that (because it's an optional) there's a chance no value will be returned. I'm guessing the method is returning nil, but because you're assigning it using a let statement, the app is crashing.
I'm a little surprised it's crashing directly on that line though. You should be able to assign nil using the let keyword. In any case, if the value is nil, you'd definitely encounter a crash on your next line when you force unwrap the optional:
var sceneData = NSData.dataWithContentsOfFile(path!, options: .DataReadingMappedIfSafe, error: nil)
^ here
Try this:
if let path = NSBundle.mainBundle().pathForResource(file, ofType: "sks") {
/* ... (your code using path) ... */
} else {
NSLog("Unable to locate path for resource: \(file)")
}
I have a feeling you'll see that NSLog() output at launch.