title: How to run rake task?
body: <p>I have an existing .rake file. It used to have one task and I added one more task to the existing rake file.</p>
  
  <p>But when I try to run, it throws an error:</p>
  
  <pre><code>rake aborted!
  Don't know how to build task ___ 
  </code></pre>
  
  <p><code>abc.rake</code> file:</p>
  
  <pre><code>namespace abcd
    namespace abcde
      task pqr do
        ------------------
      end
  
      task mno do ( new task which I added)
       ---------------------
      end
    end
  end
  </code></pre>
  
  <p>But when I used command: <code>rake abcd:abcde:mno</code> -- it showed above error</p>
  
  <p>So I used <code>rake -T -A</code> , I am able to see the rake task <code>abcd:abcde:pqr</code> but am unable to see the other one. </p>
  
  <p>I am new to rails. Please help me out.</p>
  
  <p>Thanks in advance.</p>