Unreal Editor Crashing at Start-up - Assertion failed: bAllowNonFloat [File:D:\build\++UE5\Sync\Engine\Source\Runtime\Engine\Private\Materials\HLSLMaterialDerivativeAutogen.cpp] [Line: 141] UnrealEditor_Engine

[TheIronMason]

My project keeps crashing at start-up, I cannot access the editor, It keeps making me send the crash data.

I need a quick troubleshoot.

[TheIronMason]

I figured it out. It took me 12 straight hours lol BUT I had to delete the OpenLand Materials and remove them via the File Explorer. Then I built some custom materials and everything checked out fine. There’s also a free Material Asset called “MW Landscape Auto Material” on the Epic Games Marketplace thats fully fleshed out with nanite and 4k materials thats pretty sweet. Here’s the link to how I found the MW Landscape Auto Material > https://youtu.be/w1bC0HsBmyE?si=0ZTJaC0MXgsqX74f