创建新的Rails项目时出错

Question

When I am trying to create a new rails project I am getting this error .I have never got this error .

/usr/share/rvm/rubies/ruby-2.2.1/lib/ruby/site_ruby/2.2.0/rubygems/dependency.rb:315:in `to_specs': Could not find 'activesupport' (= 4.2.5) - did find: [activesupport-4.2.4,activesupport-4.2.3,activesupport-4.2.1,activesupport-4.2.0,activesupport-4.1.5,activesupport-4.1.4,activesupport-4.1.1,activesupport-4.0.13,activesupport-4.0.4,activesupport-4.0.0,activesupport-3.2.16,activesupport-3.2.13,activesupport-3.2.11,activesupport-3.2.9,activesupport-3.2.2,activesupport-3.1.3,activesupport-3.0.3] (Gem::LoadError)
Checked in 'GEM_PATH=/home/techbirds/.rvm/gems/ruby-2.2.1:/home/techbirds/.rvm/gems/ruby-2.2.1@global', execute `gem env` for more information
    from /usr/share/rvm/rubies/ruby-2.2.1/lib/ruby/site_ruby/2.2.0/rubygems/specification.rb:1311:in `block in activate_dependencies'
    from /usr/share/rvm/rubies/ruby-2.2.1/lib/ruby/site_ruby/2.2.0/rubygems/specification.rb:1300:in `each'
    from /usr/share/rvm/rubies/ruby-2.2.1/lib/ruby/site_ruby/2.2.0/rubygems/specification.rb:1300:in `activate_dependencies'
    from /usr/share/rvm/rubies/ruby-2.2.1/lib/ruby/site_ruby/2.2.0/rubygems/specification.rb:1282:in `activate'
    from /usr/share/rvm/rubies/ruby-2.2.1/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_gem.rb:67:in `block in gem'
    from /usr/share/rvm/rubies/ruby-2.2.1/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_gem.rb:66:in `synchronize'
    from /usr/share/rvm/rubies/ruby-2.2.1/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_gem.rb:66:in `gem'
    from /home/techbirds/.rvm/gems/ruby-2.2.1/bin/rails:22:in `<main>'
    from /home/techbirds/.rvm/gems/ruby-2.2.1/bin/ruby_executable_hooks:15:in `eval'
    from /home/techbirds/.rvm/gems/ruby-2.2.1/bin/ruby_executable_hooks:15:in `<main>'

Answer 1

Seems like you don't have gem dependencies installed

Could not find 'activesupport' (= 4.2.5) - did find: [activesupport-4.2.4,activesupport-4.2.3 ..... activesupport-3.0.3] (Gem::LoadError)

specify rails version while creating new rails app

rails _4.2.16_ new my_app # change the version accordingly
# You must have rails 4.2.16 installed 

Answer 2

Seems like you are getting this error because updated version of ruby is not being used by rvm .
Run this command

rvm list
Which will give you all the ruby version installed on your system and which version of ruby is being used by your computer .Then select the latest version of ruby by this command

rvm use ruby version