Cannot resolve method 'thenReturn(java.util.HashMap<java.lang.String,java.util.Set<java.lang.String>>)

This error message typically occurs in Java unit testing when the method `thenReturn` is called with an incorrect parameter type.

In this case, the error message indicates that the method `thenReturn` is being called with a `HashMap<String, Set<String>>` parameter type, but this is not the correct type for this method.

The `thenReturn` method is typically used in unit testing to create a mock object that returns a specific value when a certain method is called. In order to use this method correctly, you need to specify the correct return value type for the method you are mocking.

To fix this error, you should check the documentation for the method you are mocking and make sure that you are using the correct return value type for the `thenReturn` method. If you are unsure of the correct type to use, you may need to consult with a Java developer or consult the Java documentation for further guidance.