Error: Action has more than one parameter bound from request body

Question

I wrote a new method into my Controller of my ASP.Net MVC project and getting error below. I think InvalidOperationException coming from with Swagger. I marked

Answer 1

I got this error by inheriting from BaseController instead of ControllerBase. It was a class from another library that is completely unrelated and I misremembered the name. The exception was a red herring for me.