/Users/hgm/XCode/Gnosys/TGuide/TGPrep/Assets.xcassets:-1: Failed to find

a suitable device for the type IBSimDeviceTypeiPad2x

(com.apple.dt.Xcode.IBSimDeviceType.iPad-2x) with runtime iOS 12.4 (12.4

- 16G73) - com.apple.CoreSimulator.SimRuntime.iOS-12-4

解决方法:

Kill all simulator processes

$ sudo killall -9 com.apple.CoreSimulator.CoreSimulatorService

Set the correct XCode path

$ sudo xcode-select -s  /Applications/Xcode.app/Contents/Developer

If not, reset all simulator

$ xcrun simctl erase all

如果还是不行

重启Mac.