Model problem

[eluser]theprodigy[/eluser]

function makelist($parentid){
$this->load->model('MMenu2');
$tree = array();
$parentid = 0;
$data['list'] = $this->MMenu2->generateTree($parentid, $tree);

$this->load->view('list2'.$data);
}

In your controller, you are passing in $tree as a reference (based on your model function declaration)
Instead of:

Code:

$data['list'] = $this->MMenu2->generateTree($parentid, $tree);

try

Code:

$this->MMenu2->generateTree($parentid, $tree);
$data['list'] = $tree;

also change

Code:

$this->load->view('list2'.$data);

to

Code:

$this->load->view('list2',$data);

(change the period to a comma inside the parenthesis)