Add Dynamic Data to Existing Site Results in Errors?

Question

I had a website and I attempted to add Dynamic Data to the site using the instructions in this MSDN article (and elsewhere, when that failed): http://msdn.microsoft.com/en-us/library/ee923692.aspx

Right now I get around seventy errors. Most of them look like this:

'ApplyEqualityFilter' is not declared. It may be inaccessible due to its protection level.

These errors are occurring in files in the DynamicData folder I copied over from a new project I made in accordance with the walkthrough above.

Any ideas?