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Re提交上传的时候报错，求教！！！ 我的项目中使用的是angular4，在提交上传的时候报错。 提交上传代码块：    uploadFile() {      const files = this.filesList;     const key = 'object';      const client = new OSS. Wrapper({      region: this.region,       accessKeyId: this.accessKeyId,      accessKeySecret: this.accesskey,       bucket: this.bucket    });     client. multipartUpload(key, files, {      progress: this.progress     }). then((( res : any) => {       alert( ` ${res } `);        console. log( 'upload success');       this.uploadStatus. emit(res);     }));  }; 报错信息见附件：求解！