NUnit.Extensions.Asp.DoctypeDtdException: Problem with DOCTYPE DTD:

I am using NUnitAsp for testing ASP.NET 2.0 pages. I am getting DoctypeDtdException.

NUnit.Extensions.Asp.Doc开发者_如何转开发typeDtdException: Problem with DOCTYPE DTD: Your DOCTYPE is probably incorrect. If you're not sure what DOCTYPE should be, user , Visual Studio .NET's default.

My page using Visual Studio 2008 default doctype.

When use only it works fine.

I am desperately looking for the solution.

help is highly appreciated.