Typically, a game engine is recorded, and then a level editor is created using the engine. I can’t imagine why you used one of these programs to develop levels for your game. They do not know anything about the game, monsters, the player, their size, environment (gravity, etc.), Items. These programs will not cause an error unless you add a spawn point. These programs will not cause an error when trying to call a player off the map.
I would suggest installing Quake 2 and tinkering with the game, as well as with the level editor, moving to Quake 3, then Doom 3 / Quake 4. It was a summer learning process for me, but I studied the workloads, not only about creating maps and game engines , but also about optimization, as well as about many small flaws and shortcomings that you would like if you tried to make your own. Even if you are not trying to do FPS, it's worth it. id knew what they were doing, and they made some damn fine engines.
I also suggest reading Masters of Doom . This is seriously such an inspiring book.
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