Invalid toolchain Error while trying to upload app into iTunes Connec

Development Platform & Builds Mobile
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I do get Invalid Toolchain Error while uploading my ios app into iTunes Connect (App Store).
This is the log:

Invalid Toolchain - New apps and app updates must be built with the public (GM) versions of Xcode 6 or later, macOS, and iOS SDK. Don’t submit apps built with beta software including beta macOS builds.

I used Unreal 4.18.2, so can’t modify plist file in ipa package, Unreal for default build a package setup for Xcode 9.1 Beta 2 and I don’t know how to change it.

Any information can help. My deadline is very close please help.

2

I found the source of issue.
I’ve been using remote build on windows to make ipa package. The thing was that Xcode version i had installed on remote mac was beta. Uninstalling the Xcode 9.1 beta2 and Installing Xcode 9.2 final solved my problem.