Editor throws an exception at testing an dungeon

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even the example map dosnt work

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"Object reference not set to an instance of an object."

-> ARPGGame.LevelList.GetLevelFile(String level) => \LevelList.cs:line 161
-> ARPGGame.LevelList.LoadLevel(WorldNode world, WorldDrawer worldDrawer, String level, SObject save) => \LevelList.cs:line 173
-> ARPGGame.GameBase.ClearLevel() => \GameBase.cs:line 494
-> ARPGGame.GameBase.Update(Int32 ms) => \GameBase.cs:line 831
-> ARPGGame.ARPGGame.OnUpdateFrame(FrameEventArgs e) => \Program.cs:line 667
-> OpenTK.GameWindow.RaiseUpdateFrame(Stopwatch update_watch, Double& next_update, FrameEventArgs update_args)
-> OpenTK.GameWindow.Run(Double updates_per_second, Double frames_per_second)
-> ARPGGame.Program.Main(String[] args) => cs:line 205