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.

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

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

https://jsfiddle.net/8kj43kyn/

// Creating an indexDB - Used to store users information.  

window.indexedDB = window.indexedDB || window.mozIndexedDB || 

window.webkitIndexedDB || window.msIndexedDB;