: java.lang.IllegalArgumentException: you must specify a way to create the tab indicator.         at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:0000)         at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:0000)         at android.app.ActivityThread.access$000(ActivityThread.java:000)         at android.app.ActivityThread$H.handleMessage(ActivityThread.java:0000)         at android.os.Handler.dispatchMessage(Handler.java:000)         at android.os.Looper.loop(Looper.java:000)         at android.app.ActivityThread.main(ActivityThread.java:0000)         at java.lang.reflect.Method.invoke(Native Method)         at java.lang.reflect.Method.invoke(Method.java:000)         at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:000)         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:000)  