ANTLR 3.4, c# The type or namespace name 'GrammarRule' could not be found
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That's it. I have correct grammar file (or I can just take example from ANTLR site) and after code generation I get this in my Visual Studio 2010. 

Runtime is already in references:
 - antlr.runtime.dll
 - Antlr3.Runtime.dll
 - Antlr3.Utility
 - StringTemplate

Any workaround or, maybe, ideads?

 - ANTLR 3.4 (language = CSharp2) 
 - C# 4.0