Cannot create TypeDescriptor with Name '{0}' on Parameter with Name '{1}' on Method with Name '{2}' on Entity (External Content ...

Cannot create TypeDescriptor with Name '{0}' on Parameter with Name '{1}' on Method with Name '{2}' on Entity (External Content Type) with Name '{3}' in Namespace '{4}'. The Identifier associated with the TypeDescriptor has Type '{5}' and the TypeDescriptor's Type resolves to '{6}'.