Hi, I made a map but all my hallways got filled with this texture, I'm not sure how to get rid of it because it doesn't appear on the grids anywhere and you cannot select it, I would really like to delete this texture so I can move through the hallways again so I can complete my map if any of you have experienced this or know how to fix it let me know thanks!
http://imgur.com/a/TJNle
http://imgur.com/a/TJNle