DoFixture error: Trying to follow fitSharp tutorial

I'm trying to follow along in the free ebook "Test Driven .NET Development With FitNesse: Second Edition" from http://gojko.net/fitnesse/book/

The HelloWorld example works great, but 2nd example (开发者_StackOverflow中文版page 41) always fails with an error of:

fitSharp.Machine.Exception.TypeMissingException: Type 'DoFixture' not found in assemblies

For the life of me, I can't figure out what is different that will make the 2nd example fail.

Using VS2005

Can anyone confirm/help?

Thanks

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OK, my error.

For the record: I forgot to make the fixture class public.

I do wish there was better error tracing/debugging.

A "debug at error" link would have solved this in an instant. Sigh.