ionic3 用file-transfer插件上传文件时，成功会失败的回调都不执行怎么回事？而且也不报错

Question

const fileTransfer: FileTransferObject = this.transfer.create();fileTransfer.upload(that.imgPath, encodeURI(url), options).then(function (data) {console.log('ok');}, function (err) {console.log('err');});