XCode 10.2升级到10.3后编译报错

XCode 10.2升级到10.3后编译报错 ：

/* com.apple.actool.errors */
/Users/admin/Documents/proj.ios_mac/ios/Images.xcassets: error: 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
Failure Reason: Failed to create new simulator device that matches IBSimDeviceTypeiPad2x (com.apple.dt.Xcode.IBSimDeviceType.iPad-2x) for runtime iOS 12.4 (12.4 - 16G73) - com.apple.CoreSimulator.SimRuntime.iOS-12-4 (Invalid runtime: com.apple.CoreSimulator.SimRuntime.iOS-12-4)
Underlying Errors:
Description: Invalid runtime: com.apple.CoreSimulator.SimRuntime.iOS-12-4

解决办法

重启一下电脑，就可以编译过了。