Thread 1: signal SIGABRT

instagramのようなアプリを作っているのですが、プロフィールを押すとクラッシュしてThread 1: signal SIGABRTの以下のようなエラーが出てしまいます。。

これはどういう意味なのでしょうか？？？

コード
2019-08-08 23:57:51.237263+0900 instaSample[5518:221699] [framework] CUIThemeStore: No theme registered with id=0
2019-08-08 23:57:54.976135+0900 instaSample[5518:221699] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Storyboard (<UIStoryboard: 0x600000339600>) doesn't contain a view controller with identifier 'RootNigationController''
*** First throw call stack:
(
	0   CoreFoundation                      0x00000001115208db __exceptionPreprocess + 331
	1   libobjc.A.dylib                     0x0000000110acbac5 objc_exception_throw + 48
	2   UIKitCore                           0x000000011b2976a9 -[UIStoryboard instantiateInitialViewController] + 0
	3   instaSample                         0x000000010df8bd27 $s11instaSample22UserPageViewControllerC14viewWillAppearyySbF + 3767
	4   instaSample                         0x000000010df8c3b3 $s11instaSample22UserPageViewControllerC14viewWillAppearyySbFTo + 51
	5   UIKitCore                           0x000000011aaff0f3 -[UIViewController _setViewAppearState:isAnimating:] + 687
	6   UIKitCore                           0x000000011aaff85e -[UIViewController __viewWillAppear:] + 131
	7   UIKitCore                           0x000000011aa5d2b5 -[UINavigationController _startTransition:fromViewController:toViewController:] + 868
	8   UIKitCore                           0x000000011aa5e0a1 -[UINavigationController _startDeferredTransitionIfNeeded:] + 896
	9   UIKitCore                           0x000000011aa5f393 -[UINavigationController __viewWillLayoutSubviews] + 150
	10  UIKitCore                           0x000000011aa40041 -[UILayoutContainerView layoutSubviews] + 217
	11  UIKitCore                           0x000000011b5dae69 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 1417
	12  QuartzCore                          0x00000001105f1d22 -[CALayer layoutSublayers] + 173
	13  QuartzCore                          0x00000001105f69fc _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 396
	14  QuartzCore                          0x0000000110602d58 _ZN2CA5Layer28layout_and_display_if_neededEPNS_11TransactionE + 72
	15  QuartzCore                          0x000000011057224a _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 328
	16  QuartzCore                          0x00000001105a9606 _ZN2CA11Transaction6commitEv + 610
	17  UIKitCore                           0x000000011b0f61aa _UIApplicationFlushRunLoopCATransactionIfTooLate + 150
	18  UIKitCore                           0x000000011b1e8f7f __handleEventQueueInternal + 6845
	19  CoreFoundation                      0x0000000111487db1 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
	20  CoreFoundation                      0x0000000111487633 __CFRunLoopDoSources0 + 243
	21  CoreFoundation                      0x0000000111481cef __CFRunLoopRun + 1231
	22  CoreFoundation                      0x00000001114814d2 CFRunLoopRunSpecific + 626
	23  GraphicsServices                    0x00000001174712fe GSEventRunModal + 65
	24  UIKitCore                           0x000000011b0fbfc2 UIApplicationMain + 140
	25  instaSample                         0x000000010df9fcdb main + 75
	26  libdyld.dylib                       0x000000011380a541 start + 1
	27  ???                                 0x0000000000000001 0x0 + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)