Validation won't work

[eluser]xwero[/eluser]
the old validation library : Validation.php, the new validation library : Form_validation.php.
Old adding of rules

Code:

$rules['author']     = 'required|min_length[5]|max_length[12]|xss_clean|trim|addslashes';
$rules['body']         = 'required|min_length[5]|max_length[150]|xss_clean|trim|addslashes';
        
$this->validation->set_rules($rules);

New adding of rules

Code:

$this->validation->set_rules('author','Author','required|min_length[5]|max_length[12]|xss_clean|trim|addslashes');
$this->validation->set_rules('body','Body','required|min_length[5]|max_length[150]|xss_clean|trim|addslashes');