Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you have been placed in read-only mode.
Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).
I can't play on mapgens, writes that Chichigaga is missing maps /map/neroxis_map_generator_1.12.3_
Can you post the client log? It might show a reason why you can't generate/save the map.