when i create a new map, the map editor closed

Hi, I believe it crashes if you haven't selected the game executable. This window can't be ignored:

I know this part's a bit clunky but you need to use this window to navigate to the directory that you installed Dungeon Keeper to. Then click on the keeperfx.exe or keeper.exe file.

If this window isn't appearing then you can open it by clicking "File -> Preferences -> Game executable" or by deleting settings.cfg

If this isn't your issue then I'll need more info.