Some White lines appear in my Pdf Elevation :(

[Anonymous]

Can anyone tell me how to remove these white lines that appear in my pdf layout elevation. it doesn't appear in my display only when i save my layout there are boom these white lines. Look a picture below

[Anonymous]

Make sure you don't have anything drawn with a white pen in your elevation.

[Erika Epstein]

The white lines look like where walls and floors are. Do you have them adjusted to the exterior walls correctly?