how do i solve this problem?
Possibly to do with having too many brushes? That's a stab anyway as I've never encountered this error before tbh. What is your map brush count anyway?
i dunno myself but i do know its wel below the limit
but however it goes away when i shrink the map
Have you used CSG subtract? That has the potential to increase your brush count if you're not careful.
For map info just press M.
yes i use that but the brush count is below 1400
Use detail brushes on anything that isn't a major "wall". So if you were modeling your house, make the walls, floors, ceilings structural (default), and all the tables, beds, chairs, lamps, etc., detail. You make it detail through one of the things in the menu, and there's a hotkey, too.
That hotkey is Ctrl-M.
;)
For future reference:
MAX_MAP_NODES = The map is too big. Simplify, make it smaller, or split it up.