Level/FOF crashes the game

[Phantom-Blade]

THIS PROBLEM IS SO ANNOYING!!! Makes me want to PUNCH everyone in the face! Sorry but that problem is so annoying...
7070(Yes, I named the level Green Greens from a game of a certain pink puffball (http://kirby.wikia.com/wiki/Green_Greens).)
Does anyone have an idea on how to fix this?

Apolagieze for my total rage there (no comments) ...

[Whackjood]

We're going to need more info to help. Could you send us a picture of the fof you think is causing the problem in your wad editor? A possible issue is that the fof has a higher floor height than the ceiling, that always crashes the game. But that's just a guess with no info.