Editor Crash - Rebuilding Class Hierarchy

+1 Yes, I can confirm this bug also exists.

For a quick workaround, MetalD…

Go to Edit->ProjectSettings->Maps & Modes:

Try selecting on drop down box there for gamemodes. If that works, go back to world settings location and try again. That should work now.

But this is only a workaround! and needs to be addressed by Epic =)

This error occurs whenever I click in gamemode section of world setting tab. Does anyone have a clue as to cause?

That works. I would have never thought to try that. Thanks so much!

Hi all,

This is a known issue in 4.8.1 that has already been reported:

issue has been fixed internally and should be included in an upcoming hotfix. There are some additional workarounds listed in linked post.

that game mode drop down causes same crash lel

It worked, thanks