Error using CakeDC search plugin in a CakePHP 2 app

I am using CakeDC search plugin in a CakePHP 2 app. Here is the code
in my model:
public $filterArgs = array(
array('name'=>'min_age', 'type'=>'expression',
'method'=>'returnNumber',
'field'=>'datediff(current_date(), User.dob)/365.25 >= ?'),
array('name'=>'max_age', 'type'=>'expression',
'method'=>'returnNumber',
'field'=>'datediff(current_date(), User.dob)/365.25 <= ?')
);
function returnNumber($arg, $name) {
return $arg[$name['name']];
}

When I first go to the page, underneath the table in the search view,
just before "previous" and "next", I get the following error:
Warning (2): vsprintf() [function.vsprintf]: Too few arguments [CORE
\Cake\basics.php, line 513]

Then when I click on "search" I also get the following error:
Warning (2): Invalid argument supplied for foreach() [APP\Controller
\Component\PrgComponent.php, line 76]

Any ideas?
Thanks.

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