where is this book's source code

and I have problem running its Try-It-Now

I follow the book and create a DLL file and ASP file, it doesn't say where to save then. I assume they should be saved in same directory. I got following error message

Error Type:
Server object, ASP 0177 (0x800401F3)
Invalid ProgID. For additional information specific to this message please visit the Microsoft Online Support site located at: http://www.microsoft.com/contentredirect.asp.
/JoCoffee/WroxCommerceTest.asp, line 9


Please help