App crash at startup

[rams78]

2016-02-12 16:48:24.804 MidiMonitor[88004:1246323] *** Assertion failure in -[UIApplication _runWithMainScene:transitionContext:completion:], /BuildRoot/Library/Caches/com.apple.xbs/Sources/UIKit_Sim/UIKit-3512.30.14/UIApplication.m:3315
2016-02-12 16:48:24.807 MidiMonitor[88004:1246323] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Application windows are expected to have a root view controller at the end of application launch'
*** First throw call stack:
(
0 CoreFoundation 0x00000001092f0e65 __exceptionPreprocess + 165
1 libobjc.A.dylib 0x0000000108cb4deb objc_exception_throw + 48
2 CoreFoundation 0x00000001092f0cca +[NSException raise:format:arguments:] + 106
3 Foundation 0x000000010713c4de -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 198
4 UIKit 0x000000010750f218 -[UIApplication _runWithMainScene:transitionContext:completion:] + 3122
5 UIKit 0x000000010750be7b -[UIApplication workspaceDidEndTransaction:] + 188
6 FrontBoardServices 0x000000010ab28754 -[FBSSerialQueue _performNext] + 192
7 FrontBoardServices 0x000000010ab28ac2 -[FBSSerialQueue _performNextFromRunLoopSource] + 45
8 CoreFoundation 0x000000010921ca31 CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION + 17
9 CoreFoundation 0x000000010921295c __CFRunLoopDoSources0 + 556
10 CoreFoundation 0x0000000109211e13 __CFRunLoopRun + 867
11 CoreFoundation 0x0000000109211828 CFRunLoopRunSpecific + 488
12 UIKit 0x000000010750b7cd -[UIApplication _run] + 402
13 UIKit 0x0000000107510610 UIApplicationMain + 171
14 MidiMonitor 0x0000000106fd5bde main + 62
15 libdyld.dylib 0x000000010a4e892d start + 1
16 ??? 0x0000000000000001 0x0 + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)

Emulator (iPhone 6 Plus iOS 9.2)

[Xample]

replace PGMidi > Sources > UI > MidiMonitorAppDelegate.m - line 23, with
[window setRootViewController:viewController];

[iooops]

Thanks! It solved my problem.