Showing warning message after increase heap memory in ubuntu

Hi,

I have 4GB ram server got an issue of heap memory error.
to fix that i added -Xmx3000 and restarted server but i see one warning message now whenever i stop or start server.

the warning message is The unit file, source configuration file or drop-ins of openfire.service changed on disk. Run ‘systemctl daemon-reload’ to reload units.

Please let me know that is there any problem?