无法调用上传图片接口

dd.ready(function() {
    $.ajax({//请求服务器后台，通过后台获取钉钉用户配置
        url : getRootPath()+"/dingtalk/getConfig.do?agent=answer",
        type : "GET",
        dataType : "json",
        success : function(data1) {
            dd.config({
                agentId: data1.agentId,
                corpId: data1.corpId,
                timeStamp: data1.timeStamp,
                nonceStr: data1.nonceStr,
                signature: data1.signature,
                jsApiList : [ 'runtime.info', 'biz.contact.choose',
        'device.notification.confirm', 'device.notification.alert',
        'device.notification.prompt', 'biz.ding.post',
        'biz.util.openLink' ]
            });
            dd.runtime.permission.requestAuthCode({
                corpId : data1.corpId,
                onSuccess : function(info) {
//                        alert('authcode: ' + info.code);
                    $.ajax({//通过code获取登录用户信息
                        url : getRootPath()+'/dingtalk/getUserInfo.do?code=' + info.code,
                        type : 'GET',
                        dataType : 'json',
                        success : function(data2) {
                            mainMethod(data2); //主方法，所有js脚本均要通过钉钉的配置验证才能启动
                        },
                        error : function(xhr, errorType, error) {
                            logger.e("yinyien:" + data1.corpId);
                            alert(errorType + ', ' + error);
                        }
                    });
                },
                onFail : function(err) {
                    alert('fail: ' + JSON.stringify(err));
                }
            });
        },
        error : function(xhr, errorType, error) {
            alert(errorType + ", " + error);
        }
    });
});

function mainMethod(data){
        $(".button").click(function(){
                   dd.biz.util.uploadImage({
                           multiple: false, //是否多选，默认false
                           max: 3, //最多可选个数
                  onSuccess : function(result) {
                              alert("图片上传成功");
                   },
                   onFail : function() {
                              alert("上传失败");
                   }
                   });
         });
}

以上是我的签名配置，所有方法写在mainMethod()之中，可以调用钉钉的弹窗接口，扫描二维码接口，但是调用不了上传图片的接口，返回的都是"上传失败"，
签名的配置也写死试过，还是不行，请大神帮忙查找下问题，万分感谢！