>>SMO was first introduced in SQL 2005 but SQL 2008 would have newer version of it.
>
>In my framework, it is compiled under Visual Studio 2008, does this mean it would then require SQL Server 2008? Because, this works on multiple Web sites but hey all have SQL Server 2008. On the one having SQL Server 2005, I get this message.

I would suspect that you'll have to install SMO 2008 on SQL 2005 server.