Terraria First Time Setup Guide
Stop your Game Server
#1 Enable the autocreation by removing the leading HashTag(#)
autocreate=3
#3 Return in the serverconfig.txt file and disable the autocreation by adding the hashtag(#)
#autocreate=3
#4 Using the file editor, locate the new generated world it should be in the folder gamehosting_saves\ModLoader\Worlds\World.wld.
Then, edit the serverconfig.txt to set the world it have to load and remove the leading hashtag(#)
world=gamehosting_saves\Worlds\World.wld
Restart your Server.