后台题目管理进入后提示错误信息

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parse error: {"readyState":4,"responseText":"<!doctype html>\n<html class=\"no-js \">\n<head>\n <meta charset=\"utf-8\">\n <meta http-equiv=\"X-UA-Compatible\" content=\"IE=edge,chrome=1\">\n <meta name=\"viewport\" content=\"width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no\">\n <meta name=\"renderer\" content=\"webkit\">\n <meta http-equiv=\"Cache-Control\" content=\"no-siteapp\"/>\n <meta name=\"description\" content=\"\">\n <meta name=\"keywords\" content=\"\">\n <title>页面出错了</title>\n <link rel=\"stylesheet\" href=\"//at.alicdn.com/t/font_1133924_1o5fgl50876.css\" />\n <style type=\"text/css\">\n body, html {background: #EEE;font:14px/20px normal Helvetica, Arial, \"微软雅黑\", sans-serif;color:#999;padding:0;margin:0;}\n .icon{text-align:center;color:#CCC;font-size:100px;line-height:100px;padding:40px 0 0 0;}\n .icon i{font-size:100px;}\n h1{color:#CCC;font-size:50px;margin:0;text-align:center;line-height:40px;margin:20 0 0 0;padding:0;}\n .content{padding-top:2em;text-align:center;}\n .suggest{padding-top:2em;text-align:center;line-height:20px;}\n .suggest a{background:#3385ff;color:#FFF;border-radius:12px;height:24px;display:inline-block;padding:0 12px;line-height:24px;text-decoration:none;margin:0 12px;}\n </style>\n</head>\n<body>\n <div class=\"icon\">\n <i class=\"iconfont iconcry\"></i>\n </div>\n <h1>\n 500\n </h1>\n <div class=\"content\">\n 您访问的页面出现错误了\n </div>\n <div class=\"suggest\">\n <p>\n <a href=\"javascript:;\" ...

是什么情况