asp.net - MvcTextTemplateHost not found

Question

I'm trying to use the T4 templates in my MVC project. This screencast suggests just copying the existing T4 templates for MVC into your solution and going from there. However when I try to compile I get this error:

Error   1   Compiling transformation: The type or namespace name   
'MvcTextTemplateHost' could not be found (are you missing a using directive
or an assembly reference?)  

I have no idea what assembly this might live in, and google isn't being much help with it. Does anyone know what assembly I should reference?

Answer 1

For each template right click, select Properties and clear the Custom Tool property. This has worked for my projects.