after having written "tool structure levels\gaigher gaigher" tool makes error

What to make?
Code: Select all
### ERROR couldn't build bsp because of overlapping surfaces (orange)
HEK-Tutorial wrote: When compiling using Tool the following error message appears:
Error Message -Way to fix it - "This is typically caused by intersecting or interpenetrating objects or object volumes. A good example would be where there are 2 cubes and one of the cubes has been placed intersecting the other."Code: Select all
"### ERROR couldn't build bsp because of overlapping surfaces (orange)"