[Uber_Soldat]

the ladder is too long. a brush can only have a certain amount of verts. each of the rungs has 4 verts [all the verts on the end face] touching the vertical bars. all those rungs touching the vertical one, each adding 4 verts to its total vert count is causing the error

select both the vertical bars, and clip them into 5 or 6 pieces [hold shift when you press enter to keep both sides of the clip]. this happens with horizontal rails aswell as ladders, or anything else where one long brush has a lot of others touching it