Rubymotion, adding interface builder: running a rake task from gem gives "Don't know how to build task 'ib'"

I have a Ruby Motion project, and I want to add Interface Builder to it.

I've added the gem: gem 'ib' But when I run bundle exec rake ib, I get Don't know how to build task 'ib'

Does any one know what I might be doing wrong? here is my gemfile:

source "https://rubygems.org"

gem "rake"
gem "ProMotion", '~> 2.0'
gem "ProMotion-push", git: 'git@github.com:BananaNeil/ProMotion-push.git', :branch => 'actionable-push-notifications'
gem "cocoapods"
gem "motion-cocoapods"
gem 'xcodeproj'


gem "bubble-wrap-http", git: 'git@github.com:BananaNeil/BubbleWrap-HTTP.git', branch: 'allow_invalid_ssl_certs'
gem "bubble-wrap"
gem "sugarcube" # monkeypatch all the things
gem "motion-yaml"

gem "motion-stump"
gem 'houston'

# Enter debugger with simple syntax
gem 'dbt' #-----> break

# Add pretty print
gem 'motion-pp'

# Handle address book for us
gem 'motion-addressbook'


gem 'ib'

Solution

Make sure to require 'ib' inside the Rakefile, either with Bundler or manually for each gem.

And if you use Bundler, you might need to remove the begin/catch guard, because it will silence all import related errors.