A quick note to what version should your Xcode is, in order to run your app during development.
Xcode major version MUST be 2 behind, and minor has to be equal or ahead from your iOS version.
e.g.
Xcode version 11.2.1 and iOS version 13.2 --> Compatible!
Xcode version 10.1 and iOS version 13.1 --> Not compatible!
Xcode version 11.4 and iOS version 13.3 --> Not compatible!
To check your iOS version, go to Settings/General/About
and for your Xcode, either on the first screen (where it says Version), or at about Xcode window.
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