Error Launching command Mongod in Ubuntu 20.041 (Focal)

The output I got from the command sudo systemctl status mongod

mongod.service - MongoDB Database Server
Loaded: loaded (/lib/systemd/system/mongod.service; enabled; vendor preset>
Active: failed (Result: signal) since Sat 2021-09-18 17:09:30 IST; 6min ago
Docs: https://docs.mongodb.org/manual
Process: 9935 ExecStart=/usr/bin/mongod --config /etc/mongod.conf (code=kil>
Main PID: 9935 (code=killed, signal=ILL)

Sep 18 17:09:29 user-desktop systemd[1]: Started MongoDB Database Server.
Sep 18 17:09:30 user-desktop systemd[1]: mongod.service: Main process exited, c>
Sep 18 17:09:30 user-desktop systemd[1]: mongod.service: Failed with result 'si> `

when I entered the command mongod it shows illegal construction