An unreal process has crashed: UE4-EpicGames launcher? HELP?

Currently Im on a mac, specs in a sec! I download this game, launcher seems to load then close until I click on the application, then brings up the message in top!!

Version 10.12
Processor 2.5 GHz Intel Core i5
memory 8 GB 1333 MHz DDR3

i have the same problem error (An Unreal process has crashes:UE4-FortniteGame-Athena) please help