Problems with CI, please HELP

[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...