UNreal 4 Keeps crash every 30 second

LogDirectoryWatcher: A directory notification for ‘…/…/…/Engine/Plugins/’ was aborted. this is log message

Hi, can anyone help me with this error, when I open the New game project I enable ray trace the game project to start by keep Crash every 30 Seconds. How to fix it, the reason I do it, I want to try GPU light mass. thank you.