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THX Tried some of these answers, did not solve it really Here is another one from the details log of the error message: Unable to launch de.myname.appname Domain: com.apple.platform.iphoneos Code: -12 Maybe the code -12 is a good hint THX

THX!dragged iPhoneOS.Platform > Device Spport >12.2 folders over into Xcode 10.1. , but in Xcode AppName>General>Deployment Info only shows"12.1" as a latest entry. Any further actions required? Terminal etc?Maybe there is something to do with the simulator folder´s deployment, too, or so?Folders of Mine from Xcode 10.2 have some extension "12.2 (16E226)". Change to "12.2" only before integrating into xcode 10.1?THX!BX