Ext:chrome报这种错,为什么请求错误呢 请前辈看下

(整个文件唯独把这段请求加上后就报错,但是这个是我从已有项目中复制过来的，应该不会有错)
Ext.Ajax.request({                        
                url: "/edu/teacherInfo.action",
                method:"get",
                success:function(response, opts){
                      var obj= Ext.decode(response.responseText);
                      store.proxy = new Ext.data.PagingMemoryProxy(obj),          //假分页
                      store.load({params:{start:0,limit:16}});
                },
                failure: function(){Ext.Msg.alert("failure");}
            });发送了请求,后台也成功接收请求收到了并拼出了正确的json串
但是Grid上空白,且Chrome报错
Uncaught SyntaxError: Unexpected token ILLEGAL               ext-all.js:7
doDecode                                                     ext-all.js:7
(anonymous function)                                         ext-all.js:7
Ext.Ajax.request.success                                     admin.js:464(我的ext文件)
Ext.extend.handleResponse                                    ext-all.js:7
f                                                            ext-base.js:7
(anonymous function)
求解,昨天晚上还正常显示数据,今早起来运行工程就出这样的错误了-.-求解 有前辈见过这种报错了 我错在哪了呢