You may have attempted to declare two functions with the same qualified name and the same number of parameters. The conflicting function signature may appear in a separate module that has been imported.

This error is also raised if you declare a function with only one parameter, and it has the same qualified name as a type that is in scope. For example, if you import a schema that contains a type named order in the namespace http://datypic.com/prod, you cannot also declare a function, with one parameter, named order in the same namespace. This is because each type has a constructor function that shares its name, and it would be impossible to distinguish between the type constructor and the user-defined function.