title: Why I'm getting this exception: Assertion failed: Can't happen, cause we filter out systems which radiosity hashes are not in LightmapSettings
body: <p>What does it mean ? How can I fix it ?
  Tried to goolge but didn't find any results about it.</p>
  
  <p><a href="https://i.stack.imgur.com/EgCFi.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/EgCFi.jpg" alt="Exception"></a></p>