TypeError: datatype_expansion.canonical_form.Exception is not a constructor

[reidlai]

What does this error mean? I encountered this error when i run osprey-mock-service -f xxx.api.raml -p 3000. Thanks for any hint

[deyikong]

@reidlai Did you figure out a solution?

[deyikong]

@reidlai and whoever has this problem.
I found out why it gave me that exception in my case.
I have one type inheriting another type, and one property in the child class overrides the same property in the parent type. Raml parser(in my case, I'm using raml-cop) didn't catch it.