Yes! It worked! Thank you , dude!
Thanks Goat!!! This works for me
I encoured same problem and after some trials, this solved for me:
1- Disable all high memory applications (you can see them in the task manager)
2- Remove failed actors/static meshes in the level, close and reopen UE, place the actors again (if you like)
3- Regenerate HLOD (if your level have it)
4- Close UE
5- Run SwarmAgent.exe (C:\Program Files (x86)\Epic Games\UE_4.26\Engine\Binaries\DotNET)
6- Open UE and rebuild lighting
Does not work for me… it keeps having me save new untitled maps