这直到今天(2017 年 5 月)才开始发生在我身上，该线程中没有任何答案解决了我的问题.我的决心来自这里;

This only started happening to me today (May 2017) and no answers in this thread solved my issue. The resolution for me was from here;

https://forums.developer.apple.com/thread/76803

打开终端.切换到主目录，

cd ~  

移动当前的传输器目录，

Move the current transporter directory,

mv .itmstransporter/ .old_itmstransporter/ 

调用以下文件让 Transporter 自行更新.

Invoke the following file to let Transporter update itself.

"/Applications/Xcode.app/Contents/Applications/Application Loader.app/Contents/itms/bin/iTMSTransporter"

等待更新，然后打开 Xcode 并尝试上传.

Wait till it updates, then open Xcode and attempt upload.