title: Sharding issue in mongo db
body: <p>When i am doing sharding then following error getting when using addShard function in mongodb:
  Please help me</p>
  
  <pre><code>"ok" : 0,
  "errmsg" : "no such command: addShard",
  "code" : 59,
  "bad cmd" : {
      "addShard" : "&lt;server name&gt;"
  }
  </code></pre>
  
  <p>Why this error is occuring ?</p>