模块不存在:books

                $this->app['lang']->load($this->app->getAppPath() . $module . '/lang/' . $this->app['request']->langset() . '.php');

                // 模块请求缓存检查
                $this->app['request']->cache(
                    $this->app->config('app.request_cache'),
                    $this->app->config('app.request_cache_expire'),
                    $this->app->config('app.request_cache_except')
                );
            } else {
                throw new HttpException(404, 'module not exists:' . $module);
            }
        } else {
            // 单一模块部署
            $module = '';
            $this->app['request']->module($module);
        }

        // 当前模块路径
        $this->app->setModulePath($this->app->getAppPath() . ($module ? $module . '/' : ''));