Rake uninitialized constant RDoc::RDoc

When ever I run make I get this 'uninitialized constant RDoc::RDoc' error

rake -T (in Main) rake aborted! uninitialized constant RDoc::RDoc C:/Ruby186/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2383:in `raw_load_rakefile' (See full trace by running task with --trace)

--edit

Running --trace it seems the only non rails code is from开发者_高级运维 rdoc_rails. Since other people seem to be able to run it fine I assume I am missing a gem or plugin but I can't figure out which.

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It looks like i have to apply both solutions for Rails (2.3.12)

1. Install rake 0.9.2
2. Install RDoc 2.4.3

gem install rdoc --version=2.4.3
gem update rake

I found side-effect of this solution, It caused another error like - Ruby on Rails and Rake problems: uninitialized constant Rake::DSL

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In my case, it was a question of updating rake: sudo gem update rake

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rdoc_rails required RDoc of 2.4.3 which isn't the latest so you have to specifically install it.