Well, first of all, your syntax is wrong. If you had read Abrar's
example...

Your code:

var $validate = array(
    'Role' => array(
        'rule' => array('multiple', array('min' => 1)),
        'message' => 'Please select at least one role'
    )
);

If you read the book pages (or Abrar's example), you'd see that it
should be the following:

var $validate = array(
    'fieldname' => array(
        'rulename' => array( // rulename can be anything you choose.
            'rule' => 'ruletype', // ruletype should be the rule
you're using, i.e. isUnique, notempty, email, multiple, etc. Use an
array if the rule has options (such as multiple).
            'message' => 'errormessage'
        )
    )
);

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