title: (Pyrebase) error : orderBy must be a valid JSON encoded path
body: <p>I use firebase and my JSON(Firebase) is as below.
  I want to retrieve the key values(<strong>288xxx</strong>) by using <strong>busStopName</strong> values.</p>
  <p><a href="https://i.stack.imgur.com/wzzEa.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/wzzEa.png" alt="enter image description here" /></a></p>
  <p>My code is as below. I'll make an example with '<strong>윤정사앞</strong>'</p>
  <pre><code># Retriving id by using value
  def getIdByName(db, name) :
      bus = db.child(&quot;busStops&quot;).order_by_child(&quot;busStopName&quot;).equal_to(name).get()
      print(bus.key())
  ...
  
  ...
  getIdByName(db, &quot;윤정사앞&quot;)
  </code></pre>
  <p>My ideal result of this code was <strong>288000001</strong>.
  But there are errors, which are '<strong>Bad Request</strong>' and '<strong>orderBy must be a valid JSON encoded path</strong>'.</p>
  <p>Please help me...</p>