Warning: brush plane with no normal?

[Zipp3R_PL]

what that mean
i have made a cable for my ski lift and thic cable disapear how many times i make it and save and load it disapear
what is this?

[MadMaximus]

try a brush cleanup to fix the bad planes, if your cable is brush work and not a patch, use edge movement instead of vertex movement, if you do a vertex move on a square brush, it can cause a wierd plane on the face, like making it 2 triangles, even though it’s square.