There was an error sending data

老版本：There was an error sending data to the App Store.Scheduling restart shortly...

新版本：There was an error sending data to the iTunes Store.Scheduling restart shortly...

一般都是网络问题，可以尝试切换稳定一些的网络。然后能点击Previous（上一步） 就点击，然后继续。如果不能点击Previous，就直接点击Cancel，然后重新上传。