In my solution when I click to launch the BOM, I immediately get this error:

NullReferenceException
  Object reference not set to an instance of an object.

Source     : MicroFour StrataFrame AddIns

Stack Trace:
   at MicroFour.StrataFrame.AddIns.PartialClassBuilderDialog.SearchWithinFolder(Project Folder)

I can't figure it out...

I don't have a "Web Deployment Project" template anywhere on my machine, but I have a "Web Setup Project" under the Other Project Types -> Setup and Deployment.  Adding one of those does not cause a problem with the BOMapper.  Could you send me a sample solution or a snapshot of your Solution Explorer so I can recreate it?