+2  A: 

Here is an issue on codeplex explaining why that error occurs.

çağdaş  2010-01-04 06:18:33
You nailed it... I was digging into it a bit and I think I was on the right track to finding that the problem was with the error pages deriving from the site master page that requires <BaseViewData>. At least it's an easy fix, I'll just craft a new master page for my error pages to derive from.Thanks!
Chad  2010-01-04 22:41:42
You're welcome :)
çağdaş  2010-01-04 23:13:38

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