Does anybody know how to apply this plugin?

I want to be able to determine whether my game is running on android emulator or on a real device. In searching for answers I stumbled across this plugin. I tried to integrate it into my project, but haven't succeeded so far.
What I did:

• Made a file named mainTemplate.gradle at the following location: Assets\Plugins\Android\mainTemplate.gradle and with the following content:
  
  Code (CSharp):

  1. allprojects {
  2. repositories {
  3.     jcenter()
  4.     maven { url "https://jitpack.io" }
  5. }
  6. }
  7.  
  8. dependencies {
  9.     compile 'com.github.mofneko:EmulatorDetector:1.1.0'
  10. }
  11.  
  12. EmulatorDetector.isEmulator(this);
• Copied the library-release.aar file into the Assets\Plugins\Android\ folder.
• Copied this snipped to the Start method:
  
  Code (CSharp):

  1.             AndroidJavaClass unityPlayer = new AndroidJavaClass("com.unity3d.player.UnityPlayer");
  2.             AndroidJavaObject context = unityPlayer.GetStatic<AndroidJavaObject>("currentActivity").Call<AndroidJavaObject>("getApplicationContext");
  3.             AndroidJavaClass cls = new AndroidJavaClass("com.nekolaboratory.EmulatorDetector");
  4.             _result = cls.CallStatic<bool>("isEmulator", context);

When I try to run the project inside the editor I get the following error:

And if I try to build the project I get a bunch of errors:

 

I managed to get rid of these errors by renaming the mainTemplate.gradle to build.gradle, but the plugin doesn't work. I ran the app on the Nox Emulator and unfortunately the plugin failed to detect that.