markdown call prompts "uninitialized constant ActionView::Helpers::TextHelper::Markdown" in upgraded application

Hey All,

I'm attempting to upgrade my app from rails 2.0.2 to 2.3.3. One bit that's failing is this call here (in /views/projects/show.html.erb)

  <%= markdown(@project.description) %>

That earns me a:

  uninitialized constant ActionView::Helpers::TextHelper::Markdown

On that line.

I'm on a rebuilt machine (windows xp, ruby 1.8.6) so I thought it was a missing bluecloth gem, but I think I fixed that (bc works in irb at least).

What would be good to diagnose & fix this problem?

Many thanks!


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