Today I uploaded my first build of first app successfully to App Store for beta testing. After making a few changes, when I tried to submit the new archive again Xcode crash
Had this problem today. I was only able to successfully upload the Archive when the organizer window was open and all Xcode projects were closed.
Archive using Xcode 6.4, submit using Xcode 7. Submission successful
The original question is: "Will re-installing XCode help me to fix it?" The answer is: "No." Re-installation does not help the problem. The bug is pretty serious though, since submitting an app is central to app development. A fix should be in the App Store asap. Hence updating later may help.
Following steps worked for me:
I had the same issue at June 17 night. I reinstalled my Xcode, and had the same issue. Looks like Apple updated something at that day, since I noticed the website of Member Center, the MAC certificate is also there. (YES!!! apple only charge once for iPhone and Mac)
Just got this problem. Seems to work if you close all other Xcode windows but keep the organizer window open.