Ruby on Rails - rspec Error `to_specs': Could not find 'rspec-core'

[BobCycler]

Bom dia Gujs,

esta me apresenatando o seguinte erro ao executar o comando rspec

[code]$ rspec spec/requests/shipping_methods/table_rate_upload_spec22.rb

/usr/local/lib/site_ruby/2.1.0/rubygems/dependency.rb:315:in to_specs': Could not find 'rspec-core' (>= 0) among 44 total gem(s) (Gem::LoadError) Checked in 'GEM_PATH=/home/railseng/.rvm/gems/ruby-2.0.0-p643:/home/railseng/.rvm/gems/ruby-2.0.0-p643@global', executegem envfor more information from /usr/local/lib/site_ruby/2.1.0/rubygems/dependency.rb:324:into_spec’
from /usr/local/lib/site_ruby/2.1.0/rubygems/core_ext/kernel_gem.rb:64:in gem' from /usr/local/bin/rspec:22:in'
[/code]

Executando ‘gem env’

[code]$ gem env
RubyGems Environment:

• RUBYGEMS VERSION: 2.4.8
• RUBY VERSION: 2.0.0 (2015-02-25 patchlevel 643) [i686-linux]
• INSTALLATION DIRECTORY: /home/railseng/.rvm/gems/ruby-2.0.0-p643
• RUBY EXECUTABLE: /home/railseng/.rvm/rubies/ruby-2.0.0-p643/bin/ruby
• EXECUTABLE DIRECTORY: /home/railseng/.rvm/gems/ruby-2.0.0-p643/bin
• SPEC CACHE DIRECTORY: /home/railseng/.gem/specs
• SYSTEM CONFIGURATION DIRECTORY: /home/railseng/.rvm/rubies/ruby-2.0.0-p643/etc
• RUBYGEMS PLATFORMS:
  • ruby
  • x86-linux
• GEM PATHS:
  • /home/railseng/.rvm/gems/ruby-2.0.0-p643
  • /home/railseng/.rvm/gems/ruby-2.0.0-p643@global
• GEM CONFIGURATION:
  • :update_sources => true
  • :verbose => true
  • :backtrace => false
  • :bulk_threshold => 1000
• REMOTE SOURCES:
  • https://rubygems.org/
• SHELL PATH:
  • /usr/local/heroku/bin
  • /home/railseng/.rvm/gems/ruby-2.0.0-p643/bin
  • /home/railseng/.rvm/gems/ruby-2.0.0-p643@global/bin
  • /home/railseng/.rvm/rubies/ruby-2.0.0-p643/bin
  • /usr/local/sbin
  • /usr/local/bin
  • /usr/sbin
  • /usr/bin
  • /sbin
  • /bin
  • /usr/games
  • /usr/local/games
  • /home/railseng/.rvm/bin
  • /home/railseng/.rvm/bin
  • /home/railseng/.rvm/bin
  • /home/railseng/.rvm/bin[/code]

Alguém pode me ajudar com isso?