validation notEmpty

I am using following code for validating a not empty field.
var $validate = array(
'blogCategoryId' => array(
'required' => array('rule' => 'notEmpty',
'message'=>'Please select Blog category.'),
)
);

It is working properly but giving the following warning:

Warning (2): preg_match() [function.preg-match]: Delimiter must not be
alphanumeric or backslash [CORE/cake/libs/model/model.php, line 2193]

Can anyone highlight what is problem in code?

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