date validation

I'm having a few problems trying to validate a date and I'm not sure what I'm doing wrong ... 

 [date] => Array                 (                     [month] =>                      [day] =>                      [year] =>                  )

 I have the validation rule in the model set up close to the example in the book. 

 'dob' => array(         'rule' => 'date',         'message' => 'Some message here.',         'allowEmpty' => false     )

 The book says if no keys are supplied the default key that will be used is 'ymd' ... that's fine. 
 
I'm not concerned about the format, I would just like to ensure the fields are not empty. 
 
When I submit the form it returns the following complaint: 
 
" preg_match() expects parameter 2 to be string, array given "
 
What am I messing up this time ? 
 
- Ed  
 

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