Rails 3.1 engine rake task doesnt work

I created a new engine with Rails 3.1.rc1

➜ (ruby-1.9.2-p180@rails3-pre) rails git:(master) be bin/rails plugin new ../first_engine --mountable
rails g scaffold project title:string

Scaffold is generated and now when I run

bundle exec rake db:migrate

I get the following error:

rake aborted!
Don't know how to build ta开发者_开发知识库sk 'app:db:migrate'

Tasks: TOP => db:migrate

Before rc1, it was working. But what happened now? I couldn't figure it out!

Here is the gist with all the steps and backtraces https://gist.github.com/990641 Can anyone put me the right direction?

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In you Gemfile or RVM Global Gemset file. Change rake to include the version. e.g.

gem 'rake', '0.8.7'

Just using rake will not work until Rails comes out with a fix. Let us know how you get on. All the best.