proxmox hostname change

i wanted to change my proxmox server hostname from pve to proxmox but when i changed the /etc/hosts and /etc/hostname and rebooted it, the web gui does not start and when i do systemctl status pve-cluster it says:

● pve-cluster.service - The Proxmox VE cluster filesystem
Loaded: loaded (/lib/systemd/system/pve-cluster.service; enabled; vendor preset: enabled)
Active: failed (Result: exit-code) since Sun 2021-09-26 11:56:24 IST; 4min 10s ago
Process: 1083...

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