gistfile1.txt

2019-11-25 11:40:48.694 10689-10689/com.example.mvvm E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.mvvm, PID: 10689
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.mvvm/com.example.mvvm.ui.main.MainActivity}: kotlin.TypeCastException: null cannot be cast to non-null type com.example.talk.ui.base.BaseFragment<*>
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2913)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3048)
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1808)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loop(Looper.java:193)
        at android.app.ActivityThread.main(ActivityThread.java:6669)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
     Caused by: kotlin.TypeCastException: null cannot be cast to non-null type com.example.mvvm.ui.base.BaseFragment<*>
        at com.example.mvvm.ui.FragmentStateChanger.handleStateChange(FragmentStateChanger.kt:50)
        at com.example.mvvm.ui.main.MainActivity.handleStateChange(MainActivity.kt:80)
        at com.zhuinden.simplestack.Backstack$1.handleStateChange(Backstack.java:95)
        at com.zhuinden.simplestack.NavigationCore.changeState(NavigationCore.java:652)
        at com.zhuinden.simplestack.NavigationCore.beginStateChangeIfPossible(NavigationCore.java:616)
        at com.zhuinden.simplestack.NavigationCore.enqueueStateChange(NavigationCore.java:598)
        at com.zhuinden.simplestack.NavigationCore.setStateChanger(NavigationCore.java:149)
        at com.zhuinden.simplestack.NavigationCore.setStateChanger(NavigationCore.java:125)
        at com.zhuinden.simplestack.Backstack.initializeBackstack(Backstack.java:290)
        at com.zhuinden.simplestack.Backstack.setStateChanger(Backstack.java:305)
        at com.zhuinden.simplestack.BackstackDelegate.setStateChanger(BackstackDelegate.java:340)
        at com.example.mvvm.ui.main.MainActivity.onCreate(MainActivity.kt:38)
        at android.app.Activity.performCreate(Activity.java:7136)
        at android.app.Activity.performCreate(Activity.java:7127)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1271)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2893)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3048) 
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78) 
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108) 
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1808) 
        at android.os.Handler.dispatchMessage(Handler.java:106) 
        at android.os.Looper.loop(Looper.java:193) 
        at android.app.ActivityThread.main(ActivityThread.java:6669) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)