问互动白板 tiw 转码docx成picture时候转码失败，报错如下，请问是怎么回事啊？

TxTranscodeService - [TID:N/A] - msg:[TencentCloudSDKException]message:FailedOperation.FileDownloadFail-code: -109, msg: File download link connect exception! requestId:67661d08-64b1-4509-a2d8-45af4fca8db4

2020-06-03 20:48:05.245 [KeepTranscodeAliveService] ERROR c.y.w.s.t.TranscodeMonitorService - [TID:N/A] - msg:转码失败，id=82576050713788416

互动白板 tiw 转码docx成picture时候转码失败，报错如上，请问是怎么回事啊