我将覆盆子pi更新为jessie（distupgrade）。在此之后，我从浏览器中收到以下错误请求一个站点：
The page isn't redirecting properly
Firefox has detected that the server is redirecting the request for this address in a way that will never complete.
This problem can sometimes be caused by disabling or refusing to accept cookies.
我想访问moaDB（就像mongoDB的phpmyadmin一样）。更新后PHPMyadmin工作正常，moaDB没有。
nginx的error.log：
PHP message: PHP Notice: Undefined variable: collection in /var/www/moaDB/index.php on line 498" while reading upstream, client: 192.168.178.25, server: , request: "GET /moaDB/index.php HTTP/1.1", upstream: "fastcgi://unix:/var/run/php5-fpm.sock:", host: "192.168.178.21"
为什么我为此请求和phpmyadmin收到此错误？