In my case I got this 2 errors: Failed to send CA Event for app launch measurements for ca_event_type: 0 event_name: com.apple.app_launch_measurement.FirstFramePresentationMetric Failed to send CA Event for app launch measurements for ca_event_type: 1 event_name: com.apple.app_launch_measurement.ExtendedLaunchMetrics Which I found belonged to a libapp_launch_measurement.dylib and after surfing in the web for a while I found that: That library(CA Event -> "Core Animation Event") it is used by Apple internally to measure the time it takes your app to present the first frame of your app, and those errors mainly occur when you are either in debug or at the simulator So to summarize it is not an error that we should worry about since it does not messes up our building or project and you can go to the Product top menu and select the option Clean Build Folder and then compile or run you project again, and that should be enough