crash when starting up

when I try to start my Minecraft 1.14.4, it starts up but when it's finished loading it crashes and sends me back to the launcher. Back at the launcher it says unexpected issue has occured. When I try to view the crash details it won't let me. However when I try to play Minecraft on 1.8.9 I can start up my launcher. Can someone help me please?

Launcher version: 2.1.5964