indexedDB Creating a database and adding content Failed to execute 'transaction' on 'IDBDatabase'
<p>This is the first time for me to use indexDB, I've created a database and now trying to add content to it. But I'm getting the following error. </p>

<blockquote>
  <p>Uncaught NotFoundError: Failed to execute 'transaction' on 'IDBDatabase': One of the specified object stores was not found.</p>
</blockquote>

<p>I've uploaded my code on jsfiddle just because its easier to show you it running. Any suggestions please ?      </p>

<p><a href="https://jsfiddle.net/8kj43kyn/" rel="noreferrer">https://jsfiddle.net/8kj43kyn/</a></p>

<pre><code>// Creating an indexDB - Used to store users information.  
window.indexedDB = window.indexedDB || window.mozIndexedDB || 
window.webkitIndexedDB || window.msIndexedDB;
</code></pre>