Fatal error: Uncaught exception 'MongoResultException' with message 'master.myzx.db:17017: The field 'background' is not valid for an _id index specification. Specification: { ns: "qa.archives", v: 2, key: { _id: -1 }, background: true, name: "_id_-1" }' in /my_data/web/home/www/framework/plugins/SMongo.class.php:272 Stack trace: #0 /my_data/web/home/www/framework/plugins/SMongo.class.php(272): MongoCollection->ensureIndex(Array, Array) #1 /my_data/web/home/www/service/ServiceMongo.class.php(31): SMongo->find(Array, Array, 16, 0, Array) #2 /my_data/web/home/www/service/ServiceDiseasefordedecms.class.php(179): ServiceMongo->mongofind(1, 16, Array, Array, Array) #3 /my_data/web/home/www/web/z/yisheng/info.page.php(141): ServiceDiseasefordedecms->getforDisease(1, Array, Array, 16) #4 [internal function]: info->pageInit(Array) #5 /my_data/web/home/www/framework/SlightPHP.php(278): call_user_func(Array, Array) #6 /my_data/web/home/www/web/z/index.php(12): SlightPHP::run() #7 {main} thrown in /my_data/web/home/www/framework/plugins/SMongo.class.php on line 272