I happened upon this gem of an error today. It is totally a red herring. I was expecting to find some kind of corruption in the XML like a missing <Project> tag or something similar; however, when I compared the .csproj file between revisions in Subversion, I found no substantial differences, only some additional files added to the project. So what gives?
Turns out that this error is caused by a problem with the .user file associated with the project. Delete the .user file and voila! it works. I can’t take credit for figuring it out. Thanks goes to the BizTalk Tips and Tricks blog here.
