Answered Fatal error after installing template, any ideas?

/**
     * Fire any pre-render events
     * @return array|bool|string
     */
    public function firePreRenderEvents() {
       $resourceId = !empty($this->resource) ? $this->resource->get('id') : (!empty($this->scriptProperties['id']) ? $this->scriptProperties['id'] : 0);
        $properties = array(
            'id' => $resourceId,
            'mode' => !empty($resourceId) ? modSystemEvent::MODE_UPD : modSystemEvent::MODE_NEW,
        );
        if (!empty($resourceId)) {
            $properties['resource'] =& $this->resource;
        }
        $onDocFormPrerender = $this->modx->invokeEvent('OnDocFormPrerender',$properties);
        if (is_array($onDocFormPrerender)) {
            $onDocFormPrerender = implode('',$onDocFormPrerender);
        }
        $this->setPlaceholder('onDocFormPrerender',$onDocFormPrerender);
        return $onDocFormPrerender;
    }