I had the same error when I tried to submit the ipa, we can't upload frameworks with simulator arquitectures i386 & x86_64 to itunes connect
In my case was because of frameworks of Carthage has i386 & 86_64 arquitectures
Then, you can try 2 options:
1.- If Carthage case > Read carthage Readme file here
Where they explains how to workaround this App Store submission bug:
On your application targets’ “Build Phases” settings tab, click the “+”
icon and choose “New Run Script Phase”. Create a Run Script with the following contents:
/usr/local/bin/carthage copy-frameworks
and add the paths to the frameworks you want to use under “Input Files”,
e.g.:
$(SRCROOT)/Carthage/Build/iOS/Box.framework
$(SRCROOT)/Carthage/Build/iOS/Result.framework
$(SRCROOT)/Carthage/Build/iOS/ReactiveCocoa.framework
2.- Remove the arquitectures that you don't need to upload
Here you have a solution with a really nice script to remove arquitectures that you don't need
Submit to App Store issues: Unsupported Architecture x86