Error when occlusion baking

I'm trying to do some occlusion baking in my scenes. I have a number of trees, cliffs, and buildings marked as static, but upon building I'm presented with these errors:

Error occurred in occluder data computation
Failure in split phase
That's all the details it provides, nothing else.

I'm using Unity 2020.1.13f1, and the latest HDRP.

 

Definitely google this error, you're never the first guy.

 

I'm afraid I think I am this time. The only relevant post is from Unity 4.5 and has been fixed, however clearly it was not.

 

Sounds like it is time for the bisection approach.

Make a trivial scene with one small occluder.. build it. Good? Continue!

If not then we have a bug. File a bug with Unity.

If a trivial scene works, take your existing scene, remove HALF the occluders. Build it.

Lather rinse repeat until you delete the offending occluder.

With that information you may be able to reason about what is happening.

 

Found the issue, I had a very large ground plane. Disabling occlusion in the static settings fixed it.

 

Exactly... as suggested in the Unity 4.3 comment from circa January 2014:

" Increasing the value of smallest occluder and/or splitting up the scene into smaller chunks will get rid of this error."

I'm tellin' ya, yer NEVER the first guy to have an issue.