Opening the Java Launcher worked fine, but when I pressed the Play tab to start the game, it says "Whoops! Sorry, something went terribly wrong and you probably encountered a bug. Please report here." I then pressed the Try Again button but it didn't do anything.
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Comments 3

Thank you for your report!
We're tracking this issue in MCL-18214, so this ticket is being resolved and linked as a duplicate.
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Don't worry, the report will be resolved by a moderator shortly 🙂
It fixed itself after I restarted it, but I don't quite know how to delete a report so-