Bug Problem building Unity SDK 4.4.1 on iOS

Hello,

I am facing an issue deploying a project using UnityAds 4.4.1 SDK to iOS.

I get the following error in Xcode:

Undefined symbol: __swift_FORCE_LOAD_$_swiftCompatibilityConcurrency



I have normally created a new Empty Swift File as you can see: called NewSwiftFile



I have also set Always Embed Swift Standard Libraries to YES. as explained here:
https://docs.unity.com/ads/InstallingTheiOSSDK.html

I don’t understand, what is the reason of the build failure?

Kind regards,