There is an error in the TypeDescriptors of Parameters on Method with Name '{0}' on Entity (External Content Type) with Name ...

There is an error in the TypeDescriptors of Parameters on Method with Name '{0}' on Entity (External Content Type) with Name '{1}' in Namespace '{2}'. The TypeDescriptors incompletely define where the Identifiers of Entity '{3}' are to be read. That Entity expects exactly '{4}' Identifiers, but only '{5}' TypeDescriptors were found from which to read them.