Was bedeutet der Fehler(Android Studio, Java)?

E/AndroidRuntime: FATAL EXCEPTION: main

  Process: com.supermario.myapplication, PID: 8893

  java.lang.NullPointerException

    at android.support.v7.app.AppCompatDelegateImpl.<init>(AppCompatDelegateImpl.java:249)

    at android.support.v7.app.AppCompatDelegate.create(AppCompatDelegate.java:182)

    at android.support.v7.app.AppCompatActivity.getDelegate(AppCompatActivity.java:520)

    at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:140)

    at com.supermario.myapplication.ErstesLevel.<init>(ErstesLevel.java:10)

    at com.supermario.myapplication.Start.onClick(Start.java:22)

    at android.view.View.performClick(View.java:4438)

    at android.view.View$PerformClick.run(View.java:18422)

    at android.os.Handler.handleCallback(Handler.java:733)

    at android.os.Handler.dispatchMessage(Handler.java:95)

    at android.os.Looper.loop(Looper.java:136)

    at android.app.ActivityThread.main(ActivityThread.java:5017)

    at java.lang.reflect.Method.invokeNative(Native Method)

    at java.lang.reflect.Method.invoke(Method.java:515)

    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)

    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)

    at dalvik.system.NativeStart.main(Native Method)

programmieren, Java, Programmierung, Android Studio
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