Could not find acceptable representation

Question

我用jquery的uploadify上传文件到后台，文件已经上传了的，但返回Json数据时老报错。其他返回json的方法都没报错，就这个报错，这是为啥？
Handler execution resulted in exception: Could not find acceptable representation

Answer 1

http://www.cnblogs.com/enshrineZither/p/3891097.html