该如何把获取到微信头像放到云存储中去？

使用wx.cloud.uploadFile()一直报错

VM2013 WAService.js:2 Unhandled promise rejection Error: cloud.uploadFile:fail undefined . uploadFile:fail createUploadTask:fail file not found

  wx.getUserProfile({

      desc: ‘用于发布动态’,

      success: (res) => {

        console.log(res);

        console.log(res.userInfo);

        wx.cloud.uploadFile({

          cloudPath: ‘userImage/’ + util.getRandName() + ‘.jpg’,

          filePath: res.userInfo.avatarUrl

        }).then(res => {

          console.log(‘用户头像保存成功’);

        })

      },