The "Play" tab of the Minecraft Launcher won't load.

When I go to the "Play" tab of the Minecraft Launcher, it says "Whoops! Sorry, something went terribly wrong and you probably encountered a bug. Please file a report." It won't let me play the game. A few years ago I was playing with this account on an iMac. It crashed for good and I got my own Laptop. I'm trying to use the same account so I don't have to buy it again. I hope that's not part of the problem.