biz.util.uploadImage使用时，报errorCode7，

dd.config({
        agentId : agentId,
        corpId : corpId,
        timeStamp :timeStamp,
        nonceStr : nonceStr,
        signature : signature,
        jsApiList : ['biz.navigation.setTitle', 'biz.util.uploadImage','device.notification.alert','biz.util.uploadImageFromCamera','biz.util.datepicker']
});


dd.error(function(err) {
        alert('dd error: ' + JSON.stringify(err));
});


dd.ready(function() {
        dd.biz.navigation.setTitle({
                title: '新增员工',
                onSuccess: function(data) {
                },
                onFail: function(err) {
                }
        });


});

function avatarUpload(){
         dd.biz.util.uploadImage({
            multiple: false, //是否多选，默认false
            max: 1, //最多可选个数
            onSuccess : function(result) {
            },
            onFail : function(err) {
                    alert('dd error: ' + JSON.stringify(err));
            }
        });
}
以上为代码