cakephp validation problem: Delimiter must not be alphanumeric or backslash

I am just starting on cakePHP and I came across this problem

Warning (2): preg_match() [function.preg-match]: Delimiter must not be alphanumeric or backslash [CORE/cake/libs/model/model.php, line 2611]

I get that when I try and add/edit a post. It's getting triggered by this validation code:

var $validate = array(
        'title' => array(
            'title_not_blank' => array(
                'rule' => 'nonEmpty',
                'message' => 'This post is missing a title'
            ),
            'title_unique' => array(
                'rule' => 'isUnique',
                'message' => 'A post with this title already exists'
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        ),
        'body' => array(
            'body_not_blank' => array(
                'rule' => 'notEmpty',
                'message' => 'Post is missing its body'
            )
        )
    );

I have no idea what to do? Any help?

You know what? You are doing validation rules/code correctly (even with multiple rules per field). The only cause of your problem is that you are writing nonEmpty instead of notEmpty (notice the t) in you first rule.

Yeah, I know how frustrating these minor things can be. Perhaps this is why we coders eventually develop OCD. :D