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I'm trying to run a migration but I keep getting the error message that is: rake aborted! Undefined method prerequisite for nil:NilClass. It seems that somehow I activated a gem called rake 0.9.3.beta.1 - however I have since changed the gem bundle install and run bundle show rake and it shows that rake 0.9.2 is installed. I'm using Git for the first time so I thought that maybe it had something to do with the application still using the beta version of rake - but I've done a push and it shows that the gemfile has been updated. and when I look down into the gem libraries I can only see the rake 0.9.2 version. Where should I be looking? I also have a Rails:Railtie deprecated warning - but I'm thinking that this doesn't have anything to do with my migration problems. Its telling me to use config.app_generators in config/application.rb instead of Railtie - but i can't see that in the file. This is the Config/application.rb file require File.expand_path('../boot', __FILE__) # Pick the frameworks you want: require "active_record/railtie" require "action_controller/railtie" require "action_mailer/railtie" require "active_resource/railtie" require "sprockets/railtie" Bundler.require *Rails.groups(:assets) if defined?(Bundler) module CrowdshareApp class Application < Rails::Application config.encoding = "utf-8" config.filter_parameters += [:password] config.assets.enabled = true end end My Gemfile looks like this: source 'http://rubygems.org' gem 'rails', '3.1.0.rc5' gem 'sqlite3' group :assets do gem 'sass-rails', "~> 3.1.0.rc" gem 'coffee-rails', "~> 3.1.0.rc" gem 'uglifier' end gem 'jquery-rails' group :development do gem 'rspec-rails', '2.0.0.beta.18' end group :test do gem 'rspec', '2.0.0.beta.18' end and the Gemfile.lock file has the foll

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