When i first download Xcode with version of 11.4 beta, I can run app on simulator and devices from flutter project. However, I had a problem when I validate and upload my app:
App Store Connect Operation Error
Invalid Toolchain. Your app was built with an unsupported SDK or version of Xcode. If you plan to submit this build to the App Store, make sure you are using the versions listed in https://help.apple.com/xcode/mac/current/#/devf16aefe3b or later.
How can I fix this?