COMException in VS2008 Conversion Wizard

The first serious project I am undertaking in VS2008 has stalled at the first hurdle.

I am attempting to upgrade a VS2005 Solution to VS2008.

This particular solution has approximately 15 projects, with 5 being WebApps.

When I open this solution in VS2008 and allow the Wizard to do it's thing, It fails on 3 of the 5 WebProjects with COMException. and nothing else.

Not the best error information.

Any thoughts?

[Update: I just realized that I had no pointer to my eventual solution.]