A: 

It sounds like the web server is running against 4.0 run time and not the 3.5 run time, as it is reading the new Browser files which do not have docomon505i definition in them.

Owen Brady
Hello there, Owen.Thank you for the response.Besides making sure that I'm targeting 3.5 framework (e.g. RightClick on Project -> Property Pages -> Build -> Target Framework), is there anything else I should do?
George