Post moved to Mod Discussions.
In general, follow the directory indicated:
...\game\gui\menus\...
and find the file mapmenu.ws.
Open that with Notepad or something. You'll see the bracket "{" somewhere in line 11. That's an open command. There needs to be a close "}" somewhere after it. Every time the open bracket happens, there needs to be a close bracket once that function is done.
There's likely an extra open bracket or an extra close bracket somewhere in line 11 or just after it. Delete the offending bracket, and that should fix that problem...though there might be more of the same problem. Sometimes, errors like this can daisy-chain.
Load order will be something different. Wouldn't worry about that yet.