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This usually means the configuration file is broken. You can either delete or rename it, and it should be recreated on the next run. You might run into more, so search your log for "failed to load" or "caused by" if it crashes again.

Thank you so much bro this has been driving me nuts. It worked! And thanks for the advice

Update: After much more digging, I finally found an answer: Microsoft must've changed something on their end that altered authentication. If multiplayer is showing as disabled for you, you need to follow the steps listed here to get your access token from a profile that authenticates normally outside the dev environment: https://gist.github.com/50ap5ud5/beebcf056cbdd3c922cc8993689428f4#minecraft-authentication-in-dev-environments In my case it turned out I just needed my access token, it may or may not still need the UUID. The guide is older so I don't know how many versions it will hold up in, but in my case this did seem to be what Eclipse was looking for.