I’ve seen virtually same error output on my “lowly” retina macbook pro (8gb ram) - We deleted a ton of starter content from project last night. We use Perforce for version control and our temporary folders are not in VCS (Intermediate, Saved.) see: Crash in Mac Editor when Packaging for iOS - Mobile - Epic Developer Community Forums Windows (Android Build Target) Packager Fails with mscorlib error - Mobile - Epic Developer Community Forums