$html->link($article['User']['username'],array('controller' => 'users','action' => 'view_profile',$article['User']['id'],array('class' => 'button','onmouseover'=>"loadtooltip(this,'$userid')",'onmouseout'=>'hidetooltip()'))));
I got this problem:

I’m doing wrong?
One or more of the variables you are passing to the link method is an array and not a string. It’s either
$article['User']['username'],$article['User']['id']or$userid.