Getting an exception with the code in the example

[guybashan]

I simply copy & paste the code in the example. My activity contains a view pager.
I get this exception:

java.lang.RuntimeException: insertShowcaseViewWithType cannot be used when the theme has no ActionBar
at com.github.amlcurran.showcaseview.targets.ActionBarReflector.getHomeButton(ActionBarReflector.java:43)
at com.github.amlcurran.showcaseview.targets.ActionBarReflector.getActionBarView(ActionBarReflector.java:36)
at com.github.amlcurran.showcaseview.targets.ActionViewTarget.setUp(ActionViewTarget.java:38)
at com.github.amlcurran.showcaseview.targets.ActionViewTarget.getPoint(ActionViewTarget.java:45)
at com.github.amlcurran.showcaseview.ShowcaseView$1.run(ShowcaseView.java:191)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6119)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)

[guybashan]

I also tried this code:

    val target = ViewTarget(R.id.toolbarBottom, this)

    ShowcaseView.Builder(this, true)
            .setTarget(target)
            .setContentTitle("title")
            .setContentText("content").build()

And got this exception:
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.view.View.getLocationInWindow(int[])' on a null object reference
at com.github.amlcurran.showcaseview.targets.ViewTarget.getPoint(ViewTarget.java:41)
at com.github.amlcurran.showcaseview.ShowcaseView$1.run(ShowcaseView.java:191)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6119)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)

[Kvaibhav01]

I also have the same error. How to resolve it?