ajaxfileupload.js插件上传图片成功后为什么会同时执行success方法和error方法，并且拿不到服务器返回的json数据
部分代码：
function fileUploader(){

            $.ajaxFileUpload({
                url:"http://file.lawyer-says.com/services/app_upload_image.ashx",
                type:'post',
                secureuri:false,
                fileElementId:'imgFile',
                dataType: 'text',
                success : function (data, status){
                    alert(data+":"+status);
                    if(typeof(data.error) != 'undefined'){
                        if(data.error != ''){
                            console.log(data.errorMsg+"errormsg");
                        }else{
                            console.log(data.errorMsg+"errormsg");
                        }
                    }else{
                        console.log(data+"datas");
                    }
                },
                error: function(data, status, e){
                    console.log(e+"e");
                }
            }) ;
        }

报错：DOMException: Blocked a frame with origin "http://pc2.lawyer.lc" from accessing a cross-origin frame.(…)

SyntaxError: Unexpected token u in JSON at position 0