(未知来源:7)kotlin android中的错误

我只是将我的Java项目转换为Android中的kotlin,之后我正面临以下问题。 这并不是说错误是?

Process: com.app.furr, PID: 12420 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.app.furr/com.app.furr.DashboardActivity}: java.lang.IllegalArgumentException: Parameter specified as non-null is null: method kotlin.jvm.internal.Intrinsics.checkParameterIsNotNull, parameter savedInstanceState at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2817) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2892) at android.app.ActivityThread.-wrap11(Unknown Source:0) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1593) at android.os.Handler.dispatchMessage(Handler.java:105) at android.os.Looper.loop(Looper.java:164) at android.app.ActivityThread.main(ActivityThread.java:6541) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767) Caused by: java.lang.IllegalArgumentException: Parameter specified as non-null is null: method kotlin.jvm.internal.Intrinsics.checkParameterIsNotNull, parameter savedInstanceState at com.app.furr.mall.list.MallListFragment.onCreateView(Unknown Source:7) at android.app.Fragment.performCreateView(Fragment.java:2611) at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1276) at android.app.FragmentManagerImpl.addAddedFragments(FragmentManager.java:2415) at android.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2194) at android.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManager.java:2148) at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:2049) at android.app.FragmentManagerImpl.dispatchMoveToState(FragmentManager.java:3044) at android.app.FragmentManagerImpl.dispatchActivityCreated(FragmentManager.java:2991) at android.app.FragmentController.dispatchActivityCreated(FragmentController.java:178) at android.app.Activity.performCreateCommon(Activity.java:6969) at android.app.Activity.performCreate(Activity.java:6977) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1213) at android.app.ActivityThread.p erformLaunchActivity(ActivityThread.java:2770 

在MallListFragment中,你需要像这样定义onCreateView

 fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?) : View? { ... }