The type or namespace name 'ProfileCommon' could not be found
What the hell does that mean?
That was my initial response.
I uploaded a new version of my .NET 2.0 website. In the process I had changed it from a File based web site, to an ASP.NET web application (same as for .NET 1.1)
After uploading it, I got that error while my site was compiling.
Eventually I tracked it down. I replaced my files instead of deleting the site clean and starting over.
As part of that, I left behind the PrecompiledApp.config file from the old version.
When I deleted it, suddenly everything started working again.