Assertion failed: GDefaultMaterials[Domain]

The error message has been “Assertion failed: GDefaultMaterials[Domain] != NULL [File:E:\UnrealEngine417-release\UnrealEngine-release\Engine\Source\Runtime\Engine\Private\Materials\Material.cpp] [Line: 433] Cannot load default material ‘engine-ini:/Script/Engine.Engine.DefaultMaterialName’”

Over and over this error code come up from file \Unreal Projects\SunTemple\Saved\Crashes\UE4CC-Windows-20E069FA4B12AE641497BB88005055C6_0000\CrashContext.runtime-xml

Most surprisingly the tilde command “show stereorendering” on Play - Standalone fails on the Binary 4.17.3573198 distribution from Epic Launcher.

Good News fixed .in 4.17.1 update

HotFix