start rabbitmq-server ERROR

I tried starting rabbitmq-server when installing rabbitmq on Ubuntu and I get the following Error:

Job for rabbitmq-server.service failed because the control process exited with error code.
See "systemctl status rabbitmq-server.service" and "journalctl -xe" for details.

rabbitmq-server.service - RabbitMQ Messaging Server
     Loaded: loaded (/lib/systemd/system/rabbitmq-server.service; enabled; vendor preset: enabled)
     Active: activating (auto-restart) (Result: exit-code) since Mon 2021-08-30 18:31:15 CEST; 5s ago
    Process: 89134 ExecStart=/usr/sbin/rabbitmq-server (code=exited, status=1/FAILURE)
   Main PID: 89134 (code=exited, status=1/FAILURE)

I already tried rm /var/lib/rabbitmq/.erlang.cookie, but permission was denied. Restarting doesn't work too. I would really appreciate it, if you could help me solve this problem :)