java.lang.NoClassDefFoundError: com.example.AndroidLib.R$layout

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java.lang.NoClassDefFoundError: com.example.AndroidLib.R$layout
at com.example.AndroidLib.MyLayout.(MyLayout.java:14)
at xamarinapp.MainActivity.n_onCreate(Native Method)
at xamarinapp.MainActivity.onCreate(MainActivity.java:28)
at android.app.Activity.performCreate(Activity.java:5244)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1082)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2034)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2095)
at android.app.ActivityThread.access$600(ActivityThread.java:135)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1201)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4849)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:795)

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