ApiController generator fails when using custom Produces attribute

[joachim-heck]

Hey Kai, we just realized a minor bug during generation of our api endpoints - seems like the generator isn't able to handle custom [Produces("CUSTOM_TYPE")] attributes. Is it a bug, or a feature?

[ky-one]

The exception comes from .NET Framework, because you have to use the attribute like this:
[Produces("application/json")]
or
[Produces(typeof(CustomType))]