Solving “Error: Could not resolve all artifacts for configuration ‘:classpath’ “

After opening the Augumenta-AIP-SDK-examples-gradle-v2.5.0.zip you are getting this error:

A problem occurred configuring root project 'EXAMPLE_PROJECT'.
> Could not resolve all artifacts for configuration ':classpath'.
   > Cannot resolve external dependency com.android.tools.build:gradle:4.0.1 because no repositories are defined.
     Required by:
         project :

it is because you are missing the repositories for the buildscript in your project root build.gradle. You can fix it by adding the repositories like this:

buildscript {
	repositories {
		google()
		jcenter()
	}
	// ...
}

NOTE: This error might be caused if you tried to run the example modules as a root project. Please follow the steps from here: How to use the Android examples with Android Studio?.