I'm creating my first app in android studio 3.4.2, when the code displays I'm getting error message like "URI is not registered".
When the code displays, it was underlined and saying
URI is not registerd
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
The code should generate the output "Hello World"
