Error with edit_template_start extension hook

A PHP Error was encountered
Severity: Warning
Message: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, 'Eehive_boilerplate_ext::boilerplate_template' was given
Filename: libraries/Extensions.php
Line Number: 261

public function activate_extension()
    {
        // Setup custom settings in this array.
        $this->settings = array();
        
        $data = array(
            'class'        => __CLASS__,
            'method'    => 'boilerplate_template',
            'hook'        => 'edit_template_start',
            'settings'    => serialize($this->settings),
            'version'    => $this->version,
            'enabled'    => 'y'
        );

        $this->EE->db->insert('extensions', $data);            
        
    }    

    // ----------------------------------------------------------------------
    
    /**
     * boilerplate_template
     *
     * @param 
     * @return 
     */
    function boilerplate_template($query, $template_id, $message) {
        
        
        
    }