title: LoadError: incompatible library version - nokogiri
body: <p>I am facing below error when I tried to </p>
  
  <p><code>run rake db:migrate</code> </p>
  
  <p>Log:</p>
  
  <pre><code>rake aborted!
  LoadError: incompatible library version - /home/ubuntu/.rvm/gems/ruby-2.3.1/gems/nokogiri-1.8.0/lib/nokogiri/nokogiri.so
  /home/ubuntu/.rvm/gems/ruby-2.3.1/gems/nokogiri-1.8.0/lib/nokogiri.rb:32:in `require'
  /home/ubuntu/.rvm/gems/ruby-2.3.1/gems/nokogiri-1.8.0/lib/nokogiri.rb:32:in `rescue in &lt;top (required)&gt;'
  /home/ubuntu/.rvm/gems/ruby-2.3.1/gems/nokogiri-1.8.0/lib/nokogiri.rb:28:in `&lt;top (required)&gt;'
  /home/ubuntu/.rvm/gems/ruby-2.3.1/gems/roadie-3.2.2/lib/roadie/inliner.rb:2:in `require'
  /home/ubuntu/.rvm/gems/ruby-2.3.1/gems/roadie-3.2.2/lib/roadie/inliner.rb:2:in `&lt;top (required)&gt;'
  /home/ubuntu/.rvm/gems/ruby-2.3.1/gems/roadie-3.2.2/lib/roadie.rb:29:in `require'
  /home/ubuntu/.rvm/gems/ruby-2.3.1/gems/roadie-3.2.2/lib/roadie.rb:29:in `&lt;top (required)&gt;'
  /home/ubuntu/.rvm/gems/ruby-2.3.1/gems/roadie-rails-1.2.1/lib/roadie/rails.rb:6:in `require'
  /home/ubuntu/.rvm/gems/ruby-2.3.1/gems/roadie-rails-1.2.1/lib/roadie/rails.rb:6:in `&lt;top (required)&gt;'
  /home/ubuntu/.rvm/gems/ruby-2.3.1/gems/roadie-rails-1.2.1/lib/roadie-rails.rb:1:in `require'
  /home/ubuntu/.rvm/gems/ruby-2.3.1/gems/roadie-rails-1.2.1/lib/roadie-rails.rb:1:in `&lt;top (required)&gt;'
  /home/ubuntu/fs_finance/config/application.rb:5:in `&lt;top (required)&gt;'
  /home/ubuntu/fs_finance/Rakefile:5:in `&lt;top (required)&gt;'
  /home/ubuntu/.rvm/gems/ruby-2.3.1/gems/rake-12.0.0/exe/rake:27:in `&lt;top (required)&gt;'
  LoadError: cannot load such file -- nokogiri/2.3/nokogiri
  /home/ubuntu/.rvm/gems/ruby-2.3.1/gems/nokogiri-1.8.0/lib/nokogiri.rb:30:in `require'
  /home/ubuntu/.rvm/gems/ruby-2.3.1/gems/nokogiri-1.8.0/lib/nokogiri.rb:30:in `&lt;top (required)&gt;'
  /home/ubuntu/.rvm/gems/ruby-2.3.1/gems/roadie-3.2.2/lib/roadie/inliner.rb:2:in `require'
  /home/ubuntu/.rvm/gems/ruby-2.3.1/gems/roadie-3.2.2/lib/roadie/inliner.rb:2:in `&lt;top (required)&gt;'
  /home/ubuntu/.rvm/gems/ruby-2.3.1/gems/roadie-3.2.2/lib/roadie.rb:29:in `require'
  /home/ubuntu/.rvm/gems/ruby-2.3.1/gems/roadie-3.2.2/lib/roadie.rb:29:in `&lt;top (required)&gt;'
  /home/ubuntu/.rvm/gems/ruby-2.3.1/gems/roadie-rails-1.2.1/lib/roadie/rails.rb:6:in `require'
  /home/ubuntu/.rvm/gems/ruby-2.3.1/gems/roadie-rails-1.2.1/lib/roadie/rails.rb:6:in `&lt;top (required)&gt;'
  /home/ubuntu/.rvm/gems/ruby-2.3.1/gems/roadie-rails-1.2.1/lib/roadie-rails.rb:1:in `require'
  /home/ubuntu/.rvm/gems/ruby-2.3.1/gems/roadie-rails-1.2.1/lib/roadie-rails.rb:1:in `&lt;top (required)&gt;'
  /home/ubuntu/fs_finance/config/application.rb:5:in `&lt;top (required)&gt;'
  /home/ubuntu/fs_finance/Rakefile:5:in `&lt;top (required)&gt;'
  /home/ubuntu/.rvm/gems/ruby-2.3.1/gems/rake-12.0.0/exe/rake:27:in `&lt;top (required)&gt;'
  (See full trace by running task with --trace)
  </code></pre>