问Android转发视频，转发成功，点击播放时报6021=uuid is empty,是怎么回事？

//添加视频消息
TIMVideoElem elem = new TIMVideoElem();
TIMVideo video = new TIMVideo();

video.setDuaration(duration); //设置视频时长
video.setType("mp4"); // 设置视频文件类型
TIMSnapshot snapshot = new TIMSnapshot();
snapshot.setWidth(width); // 设置视频快照图宽度
snapshot.setHeight(height); // 设置视频快照图高度

elem.setSnapshot(snapshot);
elem.setVideo(video);
elem.setSnapshotPath(imgPath);
elem.setVideoPath(videoPath);