`bad-setting (Reason: Unit nftables.service has a bad unit file...` when add `/etc/systemd/system` conf to nftables

us flag

System is debian 10 with nftables.
I plan to make nftalbes auto restart when failed,script as below:

cat << EOF >> /etc/systemd/system/nftables.service.d/override.conf

systemctl daemon-reload

Output shows bad-setting:

systemctl status nftables.service

nftables.service - nftables
   Loaded: bad-setting (Reason: Unit nftables.service has a bad unit file settin
  Drop-In: /etc/systemd/system/nftables.service.d
   Active: active (exited) since Sat 2021-07-24 18:57:51; 1h 13min ago
     Docs: man:nft(8)
 Main PID: 2145 (code=exited, status=0/SUCCESS)
    Tasks: 0 (limit: 4915)
   Memory: 0B
   CGroup: /system.slice/nftables.service

Where is the problem?

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