'The 'cursor' option is required' error while using the aggregation

[Xeramos]

I have the same issues like this
https://github.com/intekhabrizvi/codeigniter-mongodb-library/issues/25

but i don't understand the solve

[vidalem]

Search for aggregate function inside Mongo_db.php module, then add
'cursor' => new stdClass
to the command variable.

$command = array('aggregate'=>$collection, 'pipeline'=>$operation, 'cursor' => new stdClass);