After updating to Xcode 10.2: Invalid Toolchain error when trying to submit app to App Store

Found an entry from Apple Developer Forums that I am not the only one. No solution suggested there except waiting so that I will just wait ...

https://forums.developer.apple.com/thread/115062

FYI, I've tried this and it doesn't work.

It seems that Apple was bit "careless" previously, by not updating their backend to accept the latest XCode GM version. See this for example.

Unfortunately, it seems to me that the only possible solutions are either waiting for Apple to fix it or downgrading your XCode version to 10.1