Fixing Unknown Server Tag 'asp:Silverlight'

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When building Silverlight 2 projects in Visual Studio 2008 I found that I was getting errors on building the ASP.net page:

Unknown Server Tag 'asp:Silverlight'

It turns out that I was getting the error because my project was on a network drive.  Once I moved the project to a local drive the error stopped happening.

Thank you to my colleague Marshall Agnew for that tip.