upyun nodejs SDK创建文件夹

Question

创建文件夹：
/tangide/publish/upyun/osgames1/121425456263387/osgames1.b0.upaiyun.com/games/YinLijun/GameCenter/first
返回的错误：
-[null,{"statusCode":400,"headers":{"server":"vivi/0.4","date":"Mon, 23 Mar 2015 06:55:40 GMT","content-type":"text/html","content-length":"169","connection":"close","x-request-path":"ctn-gd-dgg-245"},"error":{"code":"Kid0001","message":"Response is not a valid json string"}}]

不明白这个是什么错误，看常用错误列表也没有说明～