I made a small change (renaming IP Address) in a project on my test box which uses MDE 2003 ver 7.1.603, Net Framework 1.1 ver 1.14322 SP1. everything works fine but when I move it to Production I get the error:

The base class includes the field 'TabStrip1', but its type (Microsoft.Web.UI.WebControls.TabStrip) is not compatible with the type of control (Microsoft.Web.UI.WebControls.TabStrip

My production box is MDE 2003 ver 7.1.3088, Net Framework 1.14322 SP1. Even if I change the code back to the original IP Address & recompile I still get the error.

Do I need to upgrade the Production box to MVS .NET 2003 to the same as my test box or a higher version, or goto Visual Studio 2010? What would be the most painless approach??