Silverlight 2 rc0 Preview Error Message

After installing silverlight tools for  visual studio

I receive the following error message in visual studio 2008 Preview

Derived method 'OnApplyTemplate' in type 'System.Windows.Controls.GridSplitter' from assembly 'System.Windows.Controls.Extended, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' cannot reduce access.

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