optimization heap size

Hello, I am following the guides on the traccar optimization page, but when I try to increase the heap,size using the commands in the guide, I get the response -Xmx1G: command not found, in both commands, xmx or xms or on other values,, can someone guide me please? thank you

What does your service config look like?

you mean taccar.xml?

I mean the place where you've added -Xmx1G.