I have no idea how to fix this. Clicking "Start anyway" crashes the launcher by the way. I have already tried reinstalling Minecraft (3 times), I've restarted my computer countless times and there is no instances of Java running in my task manager when this error occurs. I have found no answer that fixes this online.
P.S. If somehow I have been hacked and that's why my account is running somewhere else, why have they had my account running for a month? Yes, that's how long I have been trying to fix this.