How to change server map

[Pit Bull]

And when i made my own server it keep saying error!

[LeFizzy]

You can send what it wrote?

Map change:
In-config : "maps" : ["classicgen","random"], these change
In-game : /map <map_name> Will have to be Advance (command: /advance)

[Pit Bull]

i saw that but how to change how to rename?!

[MrHaaax]

(to be honest, my inner me is prompting me to call you an utter retard, but there are rules so yeah).
You can edit the config with Notepad if you're on Windows. You must right-click>open with or it won't open. The config should contain everything you need.