Not Found, The file public/m/ does not exist

I used to have Pocketmine MP, but uninstalled it. When i go to "play on realms" -> "login/sign up" a completely white window appears saying:

Not Found
The file public/m/ does not exist

Ps ive never had or been whitelisted on a server - i dont know if installing pocketmine MP has caused this bug either. And i thought it had been fixed