i went on interloper and this came up
This error is usually followed by something like this:
Leaf 0 contents
may vary)
Leaf 1 contents: CONTENTS_SOLID (may vary, e.g. CONTENTS_WATER)
viscontents (node 0 contents ^ node 1 contents): CONTENTS_SOLID (ditto)
This means that none of the brushes in leaf 0 or 1 that touches the portal
has CONTENTS_SOLID
Check for a huge brush enclosing the coordinates above that has contents
CONTENTS_SOLID
Candidate brush IDs: [none or more brushnumbers]
Usually, this error is caused by a leak, so fix it if it is.
If it isn't, there is a (group of) brush(es) that is/are giving vbsp.exe a hard time to figure out your level.
Apparently it cannot determine the boundaries of a certain portal. Maybe there is a large brush covering the area, maybe the area is just to complicated for poor vbsp to figure out.
I don't know the details but usually turning entities to world brushes or vice-versa helps to fight the problem. Hell, just cutting a brush in two once helped me fight this problem.
Solution:
Find the given coordinates (or if a brush number is given search for the brush number) and see what you can do to to simplify the area (like turning brushes to func_detail). You should also check to see if the brushes are overlapping at any point.
what dose this mean