How to use Range as udf's input parameter?

I have a function, it use Range as its parameter, and return this parameter's adrresss:
```c#
[ExcelFunction(Description = "", Category = "")]
public static string address(Excel.Range rg)
{
return rg.get_Address();
}
```
i add a reference `Microsoft.Office.Interop.Excel` to project. and it can be compiled successfully. when i call excel, it failed:
> Initialization [Error] Method not registered - unsupported signature, abstract or generic: 'ExcelFunctions.address'

i expect excel's cell input formula:

> = address(C1)

the cell value will be a text:

> C1