title: Error On Running Ruby Code named "No SDKs Specified"
body: <p>I have downloaded RubyMine IDE to run ruby code . I have written the following code:</p>
  
  <pre><code>puts 'hellow world'
  </code></pre>
  
  <p>But I have a error when I want to run this smallest program . The IDE shows the following error . </p>
  
  <pre><code>"No SDKs specified"
  </code></pre>
  
  <p>Why ? What to do if I want to solve this problem ? I am a beginner in this language . Can you guys help me in this regard ? Also I want your suggestion . Is "RubyMine" best IDE for Ruby ? What IDE is used by you ? </p>