If you are experiencing issues creating a build of your Unity game, it is likely you are facing a dependency conflict. MAS includes many 3rd party SDKs, and in order to resolve the conflicts, you can now use the Dependency Conflict Checking Tool built into MAS 4.2. Follow the instructions below to get started.
Using the Dependency Conflict Checking Tool
First, open the Assets menu, find the menu item Yodo1, and select MAS Conflict Manager.
Next, you will receive a pop up window listing down the conflicting files and folders in your build, which you will need to remove.
Delete the referenced folders and try your build again!