Improve the error message for methods as named parameters

[Tagada14]

Methods as named parameters were introduced in #58
However, when an error occurs only the name of the method is printed, the owner is omitted even though it would be useful information for programmers. Introducing such a feature is non-trivial since the function to acquire the owner of a method is part of the module TypeUtils that utilizes the Error module. Thus, using that function would create a dependency cycle.