region already defined Error Template Library Version 1.4.1

[eluser]Unknown[/eluser]
for a better understanding, see the below code.

Code:

$template['default']['template'] = 'template';
$template['default']['regions'] = array(
'header' => array('content' => array('<h1>CI Rocks!</h1>')),
'title',
'content',
'sidebar',
'footer'=>array('content' => array('<p id="copyright">© Own Company Inc.</p>')),
);
$template['default']['parser'] = 'parser';
$template['default']['parser_method'] = 'parse';
$template['default']['parse_template'] = FALSE;