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In the last submission of our application, we have received this warning :
Invalid WatchKit Support - Starting April 1, 2018, all apps submitted to the App Store for Apple Watch must be built with the watchOS 2 SDK or later
My question is to know how to to build the application with the watchOS 2 SDK?
I was thinking that is enough to build with XCODE 9.
Thank's.
Check your Deployment Target. It's likely it wasn't updated just by using a newer version of Xcode.
Also try checking Base SDK in Build Settings of your Watch Extension to make sure it is up to date.