我遵循了MongoDB为社区服务器安装提供的所有步骤，当我尝试启动它时，出现以下错误。
● mongod.service - MongoDB Database Server
Loaded: loaded (/usr/lib/systemd/system/mongod.service; enabled; vendor preset: disabled)
Active: failed (Result: exit-code) since Wed 2020-03-11 18:42:45 +03; 6s ago
Docs: https://docs.mongodb.org/manual
Process: 3318 ExecStart=/usr/bin/mongod $OPTIONS (code=exited, status=48)
Process: 3315 ExecStartPre=/usr/bin/chmod 0755 /var/run/mongodb (code=exited, status=0/SUCCESS)
Process: 3312 ExecStartPre=/usr/bin/chown mongod:mongod /var/run/mongodb (code=exited, status=0/SUCCESS)
Process: 3310 ExecStartPre=/usr/bin/mkdir -p /var/run/mongodb (code=exited, status=0/SUCCESS)
Mar 11 18:42:45 localhost.localdomain systemd[1]: Starting MongoDB Database Server...
Mar 11 18:42:45 localhost.localdomain mongod[3318]: about to fork child process, waiting until server is ready for connections.
Mar 11 18:42:45 localhost.localdomain mongod[3318]: forked process: 3321
Mar 11 18:42:45 localhost.localdomain mongod[3318]: ERROR: child process failed, exited with error number 48
Mar 11 18:42:45 localhost.localdomain systemd[1]: mongod.service: control process exited, code=exited status=48
Mar 11 18:42:45 localhost.localdomain systemd[1]: Failed to start MongoDB Database Server.
Mar 11 18:42:45 localhost.localdomain systemd[1]: Unit mongod.service entered failed state.
Mar 11 18:42:45 localhost.localdomain systemd[1]: mongod.service failed.
我不明白这是什么错误。我该如何解决？