Project <Project> has been destroyed, and cannot be rebuilt

VSS may not be able to reproduce the project version you requested. This error has the following cause and solution:

You permanently destroyed a subproject or moved the subproject to another location. For example, there may have been a subproject that you deleted or purged. Later, you attempt to go back to an earlier version of the project. VSS attempts to reconstruct the project exactly as it was in the past, but it cannot, because the subproject cannot be recovered.
Click Yes, and VSS tries to restore the old project version, but restoration is not guaranteed.
Click No, and the attempt to restore an old project version is halted.
Click Yes All, and VSS does not notify you that other selected subprojects may also be unrecoverable, but continues with the best possible reconstruction.