[eluser]Unknown[/eluser]
I got the same error, actually in autoload.php we don't need to change this:
$autoload['core'] = array('database');
I just change this:
$autoload['libraries'] = array('database');
and leave the core autoload to default:
$autoload['core'] = array();
It works....
But any expert out there, can help me explain this, I still confuse about this configuration :-)
Adios...