A wall (linedef) in my map is one big bsp hole.
I've tried everything to fix it.
It doesn't show up in the error checking search and only shows up in the game.
In Sector Selection mode the room with the bad wall highlights when my cursor is only NEXT to the bad linedef.
I dont' think it's my fault, I didn't do anything wrong.
I've used other tools for mapping for years.
The room was fine until I deleted a certain linedef. (Wasn't an important one)
A person can't map if he can't delete unwanted linedefs.
Hopefully this is a fixable error and I can salvage my room.
The bad linedef is the leftmost one.