title: Error using --watch . in SASS
body: <p>I have used SASS alot and I never had an error or problem with it. But today I tried to watch my css folder this error came up. I tried to solve it by google/search on Stack overflow but coulden´t find any good answer.</p>
  
  <blockquote>
    <p>sass --watch.</p>
  
  <pre><code>C:/Ruby21-x64/lib/ruby/2.1.0/rubygems/dependency.rb:298:in `to_specs': Could not
  find 'sass' (&gt;= 0) among 8 total gem(s) (Gem::LoadError)
  from C:/Ruby21-x64/lib/ruby/2.1.0/rubygems/dependency.rb:309:in `to_spec
  '
  from C:/Ruby21-x64/lib/ruby/2.1.0/rubygems/core_ext/kernel_gem.rb:53:in
  `gem'
  from C:/Ruby193/bin/sass:22:in `&lt;main&gt;'
  </code></pre>
  </blockquote>