Form Validation - returns "(Anonymous function)"

i dont understand what you mean @ciadmin 

but nevertheless i solved the problem and it whas on my side

i needed to wrap the rule to an additional array
after that it worked fine (i just thought i don't need it because i do only have one rule)

so the solution was

PHP Code:

$this->arrValidationRules[] = array(
    'field' => 'personid',
    'label' => 'Duplicatecheck',
    'rules' => array(array('check_duplicates', array($this->ci()->Cppersonsave_model,'duplicatesCheck')))
); 


But on the other hand the line 687 of the form_validation Library doesn't make any sense to me