@mitchb6 said in Mango 3.7.7 free version will not start:

Caused by: java.lang.NoClassDefFoundError: jdk/nashorn/api/scripting/ClassFilter

The version/flavor of Java you are using doesn't have the nashorn scripting classes (which are required for Mango). We are working to migrate away from that but Mango 4.0.0 will still have this dependency too.