The method Scopes() does not seem to exist on object<AdvancedLearning\...ensions\GroupExtension>.
This check looks for calls to methods that do not seem to exist on a given type.
It looks for the method on the type itself as well as in inherited classes or
implemented interfaces.
This is most likely a typographical error or the method has been renamed.
This check marks private properties in classes that are never used. Those properties can be removed.