The version of iOS SDK (11.3) that’s installed on this computer does not match the target iOS version (11.2). You may encounter issues building or incompatibilities at runtime.
You should consider updating your version of Xcode or using xcode-select to enable a compatible version.
iOS 11.3
Xcode 9.3
Corona Simulator Version 2017.3184 (2017.12.8)
Where is the problem?