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Can you help me help you by providing more information? For example, the chapter, page,and exercise number would help. So does posting the code for your web.config file and a description of the contents of your app_themes folder.
I had missed a step earlier to eliminate all of the code in the BasePage in the Try It Out starting on p. 210.
Ended up starting at a save .zip I had back from end of Chapter 4 and started there...moved forward and caught my error.