title: adb server didn't ACK while working on MAC
body: <p>I am running my android appium execution on MAC machine.</p>
  <p>I have installed android studio and have set the path variable.</p>
  <p>While executing <code>adb start-server</code> I got below error:</p>
  <blockquote>
  <p>adb server version (32) doesn't match this client (36); killing...</p>
  <p>error: could not install smartsocket listener: Address already in use</p>
  <p>ADB server didn't ACK</p>
  <p>failed to start daemon</p>
  <p>error: cannot connect to daemon </p>
  </blockquote>
  <p>Firewall setting is turned OFF and no other <code>ADB</code> present like <code>GenyMotion</code>.</p>