上传市场时提示 app 瘦身错误？

[liuyx7894]

errors occurred in the app thinning process, and your app couldn ’ t be thinned. If your app contains bitcode, bitcode processing may have failed. Because of these errors, this build of your app will not be able to be submitted for review or placed on the App Store. For information that may help resolve this issue, see Tech Note 2432.

自从 9 月 9 号更新了 XCode 8 上传就出现了这个问题，然后降级为 7.3.1 上传也还是这个问题。

https://forums.developer.apple.com/message/176455 这里也有好多人提问，但是官方并没有给解决方案。

有人遇到这个问题并有结局方案吗？