Sector not closed

[rabbitslayer]

I keep getting problems with with the sector not being closed.I would like to know if there is a way to fixthem without losing half the map.This problem usually shows up when i delete a sector.What does bug me is sometimes the problem happens where i wasnt messing around with the map.I use doombuilder

[stewboy]

Well, there's a number of reasons why a sector might not closed, and so you might want to post a screenshot of the problem. If you're getting a line seemingly belonging to a sector it shouldn't, check it's references (linedef properties -> sidedefs), make sure they're to the correct sector(s).

[rabbitslayer]

That was the the problem the references were all messed up.Thank you