ios - NSInternalInconsistencyException in App Delegate -


i new ios, using swift. code crashing nsinternalinconsistencyexception, not sure why happening , how trace issue. here stack trace.

fatal exception: nsinternalinconsistencyexception 0  corefoundation                 0x1869111b8 __exceptionpreprocess 1  libobjc.a.dylib                0x18534855c objc_exception_throw 2  corefoundation                 0x18691108c +[nsexception raise:format:] 3  foundation                     0x1873c902c -[nsassertionhandler handlefailureinmethod:object:file:linenumber:description:] 4  uikit                          0x18cfcdae0 -[uipageviewcontroller queuingscrollview:didendmanualscroll:torevealview:direction:animated:didfinish:didcomplete:] 5  uikit                          0x18d09fcbc -[_uiqueuingscrollview _notifydelegatedidendmanualscroll:torevealview:direction:animated:didfinish:didcomplete:] 6  uikit                          0x18d09fa14 __78-[_uiqueuingscrollview _enqueueanimatedscrollindirection:withview:completion:]_block_invoke.299 7  uikit                          0x18d09bb38 -[_uitransitionstate cleanupwithfinishedstate:completedstate:] 8  uikit                          0x18d09e7b8 -[_uiqueuingscrollview _cleanupcompletionstate:didfinish:didcomplete:] 9  uikit                          0x18d09ec58 -[_uiqueuingscrollview _enqueueanimatedscrollindirection:withview:completion:] 10 uikit                          0x18d09ff0c -[_uiqueuingscrollview setview:direction:animated:completion:] 11 uikit                          0x18cfcac10 -[uipageviewcontroller _setviewcontrollers:withscrollindirection:animated:completion:] 12 uikit                          0x18cfccb48 -[uipageviewcontroller _handlepagingindirection:completion:] 13 uikit                          0x18cfce714 -[uipageviewcontroller _pagecontrolvaluechanged:] 14 uikit                          0x18c7f4d30 -[uiapplication sendaction:to:from:forevent:] 15 uikit                          0x18c7f4cb0 -[uicontrol sendaction:to:forevent:] 16 uikit                          0x18c7df128 -[uicontrol _sendactionsforevents:withevent:] 17 uikit                          0x18cc8c1dc -[uipagecontrol endtrackingwithtouch:withevent:] 18 uikit                          0x18c7f4558 -[uicontrol touchesended:withevent:] 19 uikit                          0x18c7f40c4 -[uiwindow _sendtouchesforevent:] 20 uikit                          0x18c7ef328 -[uiwindow sendevent:] 21 uikit                          0x18c7bfda0 -[uiapplication sendevent:] 22 uikit                          0x18cfa975c __dispatchpreprocessedeventfromeventqueue 23 uikit                          0x18cfa3130 __handleeventqueue 24 corefoundation                 0x1868beb5c __cfrunloop_is_calling_out_to_a_source0_perform_function__ 25 corefoundation                 0x1868be4a4 __cfrunloopdosources0 26 corefoundation                 0x1868bc0a4 __cfrunlooprun 27 corefoundation                 0x1867ea2b8 cfrunlooprunspecific 28 graphicsservices               0x18829e198 gseventrunmodal 29 uikit                          0x18c82a7fc -[uiapplication _run] 30 uikit                          0x18c825534 uiapplicationmain 31 first application           0x10021a774 main (appdelegate.swift:14) 32 libdispatch.dylib              0x1857cd5b8 (missing)

only code know in stack trace appdelegate.swift:14 the

class appdelegate: uiresponder, uiapplicationdelegate {


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