thinkphp系统发生错误？

Question

网上下载的源码，原本是有用的刚刚切换了百度云虚拟主机的运行模式，然后就出错了

网站：http://xs.bbc321.top/

只要访问导航栏就报错，比如点击玄幻小说，是什么原因呢？

13013:Filesort Rows Exceeded [ SQL语句 ] : SELECT * FROM yg_articles a LEFT JOIN yg_article_views av ON a.id=av.aid WHERE ( a.thumb is not null and a.info is not null and cate='xuanhuan' ) ORDER BY av.monthviews desc LIMIT 6

错误位置

FILE: /home/bae/app/ThinkPHP/Library/Think/Db/Driver.class.php 　LINE: 350

TRACE

#0 /home/bae/app/ThinkPHP/Library/Think/Db/Driver.class.php(350): E('13013:Filesort ...')
#1 /home/bae/app/ThinkPHP/Library/Think/Db/Driver.class.php(180): Think\Db\Driver->error()
#2 /home/bae/app/ThinkPHP/Library/Think/Db/Driver.class.php(946): Think\Db\Driver->query('SELECT * FROM y...', false)
#3 /home/bae/app/ThinkPHP/Library/Think/Model.class.php(579): Think\Db\Driver->select(Array)
#4 /home/bae/app/Application/Home/Controller/IndexController.class.php(162): Think\Model->select()
#5 [internal function]: Home\Controller\IndexController->showlist()
#6 /home/bae/app/ThinkPHP/Library/Think/App.class.php(173): ReflectionMethod->invoke(Object(Home\Controller\IndexController))
#7 /home/bae/app/ThinkPHP/Library/Think/App.class.php(110): Think\App::invokeAction(Object(Home\Controller\IndexController), 'showlist')
#8 /home/bae/app/ThinkPHP/Library/Think/App.class.php(204): Think\App::exec()
#9 /home/bae/app/ThinkPHP/Library/Think/Think.class.php(120): Think\App::run()
#10 /home/bae/app/ThinkPHP/ThinkPHP.php(97): Think\Think::start()
#11 /home/bae/app/index.php(26): require('/home/bae/app/T...')
#12 {main}

ThinkPHP^3.2.3 { Fast & Simple OOP PHP Framework } -- [ WE CAN DO IT JUST THINK ]