Automapper isn't using extension methods for mapping - automapper

Question

I have automapper setup like this
services.AddAutoMapper(typeof(MappingAssembly).Assembly, typeof(AssemblyWithExtensionMethods).Assembly);
And in one of my profiles
public class UserModuleMapper : Profile {
public UserModuleMapper() {
IncludeSourceExtensionMethods(typeof(UserGroup));
CreateMap<UserGroup, UserGroupDto>(MemberList.Destination);
}
}
And I have defined the extension method as
public static List<string> GetRoleNames(this UserGroup group) {
return group.UserGroupRoles.Select(x => x.Role.Name).ToList();
}
I have a property on DTO defined as
public List<string> RoleNames { get; set; }
As per the automapper documentation, I have made the following assumptions:
IncludeSourceExtensionMethods, which include extension methods while mapping
while mapping it will also look for methods with prefix Get
But when I validate the automapper extension I get error for unmapped property
Unmapped properties: RoleNames
What is missing in my configuration, automapper should detect the extension method.
I have tried (a) remove GET from the method name, but still does not work (b) moving CreateMap before or after the IncludeSourceExtensionMethods to see if sequence matters, but none of it helped.

Answer 1

With in few minutes after posting the question I got the answer by carefully looking at this issue on Github
The issue was with below statement
IncludeSourceExtensionMethods(typeof(UserGroup));
the type mentioned here should be of extension class
IncludeSourceExtensionMethods(typeof(UserGroupExtensions));
Not deleting the question, as it might help someone in future.