No Rspec gem found in sdk through IntelliJ - ruby

Question

I am trying to get a project to work that was created through RubyMine. I have an ultimate version of IntelliJ and would rather use that with the Ruby plugin to run these tests.
However when I attempt to run I get an error saying "No Rspec gem found in SDK". I havent
My Gem environment looks like this:
mac:~ cmietzner$ gem environment
RubyGems Environment:
- RUBYGEMS VERSION: 2.4.7
- RUBY VERSION: 2.2.1 (2015-02-26 patchlevel 85) [x86_64-darwin14]
- INSTALLATION DIRECTORY: /Users/colemietzner/.rvm/gems/ruby-2.2.1
- RUBY EXECUTABLE: /Users/colemietzner/.rvm/rubies/ruby-2.2.1/bin/ruby
- EXECUTABLE DIRECTORY: /Users/colemietzner/.rvm/gems/ruby-2.2.1/bin
- SPEC CACHE DIRECTORY: /Users/colemietzner/.gem/specs
- SYSTEM CONFIGURATION DIRECTORY: /etc
- RUBYGEMS PLATFORMS:
- ruby
- x86_64-darwin-14
- GEM PATHS:
- /Users/colemietzner/.rvm/gems/ruby-2.2.1
- /Users/colemietzner/.rvm/gems/ruby-2.2.1#global
- GEM CONFIGURATION:
- :update_sources => true
- :verbose => true
- :backtrace => false
- :bulk_threshold => 1000
- REMOTE SOURCES:
- https://rubygems.org/
- SHELL PATH:
- /Users/colemietzner/.rvm/gems/ruby-2.2.1/bin
- /Users/colemietzner/.rvm/gems/ruby-2.2.1#global/bin
- /Users/colemietzner/.rvm/rubies/ruby-2.2.1/bin
- /usr/local/bin
- /usr/bin
- /bin
- /usr/sbin
- /sbin
- /usr/local/git/bin
- /Users/colemietzner/.rvm/bin

Answer 1

Your problem is that IntelliJ created your mobile as a Java-oriented module. One can tell by the little blue square next to the module name.
This fixed it for me:
Open Project Structure
Click on Modules under Project Settings
Delete the module (via -)
Add a new module, and choose Ruby (or rails, or whatever you need)

Answer 2

I realise this is an old question but I ran into the same problem and solved it as follows:
The Problem:
In the intelliJ configuration screen shown in the screenshot above (found in "Run" > "edit configurations"), you can see the configuration is trying to "Choose the SDK from the module". And of course there are no Ruby binaries inside the module (the project directory) so it throws the "No SDK found" error.
The solution:
(Assuming all the appropriate gems have been $ bundle install'd) I found the solution was to select "Use other SDK and 'rspec' gem:" and choose the appropriate SDK. BUT to ensure this applies to the whole project, I replicated this change in "Defaults" configuration for both Ruby and RSpec.
e.g for Ruby settings:
and for RSpec settings: