How to add an include layout in coordinator layout in Android Studio?

Question

I created two XML activities. One is for the activity interface layout and another one is the for the coordinator layout. I added the included layout for the interface layout activity into the coordinator layout and I can't see my interface layout from the preview. The preview is blank and these are the errors it's showing me:

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Error 1: RENDER PROBLEMS
<item> tag requires a 'drawable' attribute or child tag defining a drawable
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Error 2: can't make a decor toolbar out of relative layout

java.lang.IllegalStateException: Can't make a decor toolbar out of RelativeLayout
at android.support.v7.widget.ActionBarOverlayLayout.getDecorToolbar(ActionBarOverlayLayout.java:549)
at android.support.v7.widget.ActionBarOverlayLayout.pullChildren(ActionBarOverlayLayout.java:538)
at android.support.v7.widget.ActionBarOverlayLayout.onMeasure_Original(ActionBarOverlayLayout.java:339)
at android.support.v7.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java)
at android.view.View.measure_Original(View.java:22071)
at android.view.View_Delegate.measure(View_Delegate.java:80)
at android.view.View.measure(View.java:22035)
at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:715)
at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:461)
at android.view.View.measure_Original(View.java:22071)
at android.view.View_Delegate.measure(View_Delegate.java:80)
at android.view.View.measure(View.java:22035)
at com.android.layoutlib.bridge.impl.RenderSessionImpl.measureView(RenderSessionImpl.java:590)
at com.android.layoutlib.bridge.impl.RenderSessionImpl.inflate(RenderSessionImpl.java:343)
at com.android.layoutlib.bridge.Bridge.createSession(Bridge.java:384)
at com.android.tools.idea.layoutlib.LayoutLibrary.createSession(LayoutLibrary.java:193)
at com.android.tools.idea.rendering.RenderTask.createRenderSession(RenderTask.java:544)
at com.android.tools.idea.rendering.RenderTask.lambda$inflate$3(RenderTask.java:678)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)

Answer 1

The Mastering Coordinator Layout lessons provided on the GitHub explains exactly what needs to be done in order to make it work. I recommend checking the following URL to access the lessons.

Also, the developers of Android Studio have set up a page with the exact instructions and information on how to proceed with the development part.

Answer 2

you have not use the correct layouts styles.
you have not import necessary libraries for used your layouts.
without choosing a right layout you can not view the preview of your application.
first you import Design, Viewcart, Compilers or implimentations libraries from gradle (app) file.