shadowsocks-libev.service; enabled; vendor preset: disabled

[vonecho]

● shadowsocks-libev.service - Shadowsocks-libev Server
Loaded: loaded (/etc/systemd/system/shadowsocks-libev.service; enabled; vendor preset: disabled)
Active: failed (Result: exit-code) since 五 2023-04-21 12:05:58 EDT; 7s ago
Process: 12671 ExecStart=/usr/local/bin/ss-server -c /etc/shadowsocks-libev/config.json -u (code=exited, status=255)
Main PID: 12671 (code=exited, status=255)

4月 21 12:05:58 approved-wall-2.localdomain systemd[1]: Started Shadowsocks-libev Server.
4月 21 12:05:58 approved-wall-2.localdomain systemd[1]: shadowsocks-libev.service: main process exited, code=exited, status=255/n/a
4月 21 12:05:58 approved-wall-2.localdomain systemd[1]: Unit shadowsocks-libev.service entered failed state.
4月 21 12:05:58 approved-wall-2.localdomain systemd[1]: shadowsocks-libev.service failed.

config.jon
{
"server":"0.0.0.0",
"server_port":16253,
"local_port":1080,
"password":"password",
"timeout":300,
"method":"aes-256-gcm",
"nameserver":"8.8.8.8",
"no_delay":true,
"mode":"tcp_and_udp",
"plugin":"v2ray-plugin",
"plugin_opts":"server;tls;host=xxxx;cert=/etc/shadowsocks-libev/xxx.cer;key=/etc/shadowsocks-libev/xxx.key""
}

sudo vi /etc/systemd/system/shadowsocks-libev.service

[Unit]
Description=Shadowsocks-libev Server
After=network-online.target
Wants=network-online.target

[Service]
Type=simple
User=nobody
ExecStart=/usr/local/bin/ss-server -c /etc/shadowsocks-libev/config.json -u
Restart=on-abort

[Install]
WantedBy=multi-user.target

what is wrong?

[vonecho]

Please answer these questions before submitting your issue. Thanks!

(Please mention that if the issue you filed is solved, you may wish to close it by yourself. Thanks again.)

(PS, you can remove 3 lines above, including this one, before post your issue.)

What version of shadowsocks-libev are you using?
shadowsocks-libev 3.3.5 + v2ray plugin 1.3.2

What operating system are you using?
centos 7 x64

What did you do?
vps