* JAuthentication::__construct: Could not load authentication libraries.
* Username and password do not match
******************************************************************
1. Login to your PHP MySQL Control Panel
2. Go to Jos_plugins table
3. Change the value of "published" in the top row, Authentication - Joomla!, from 0 to 1.
*See the screenshot below for a picture of the value your need to change and its location in the Jos_plugins table.