Unreal Engine process crashes on startup for project PLEASE HELP

trotter · August 18, 2025, 1:19pm

Haven’t worked on this project for two weeks it was working fine last time everything saved and now while trying to open it, it continues to crash on start up no matter what I try.

Assertion failed: Trailer != nullptr [File:D:\build++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\Serialization\EditorBulkData.cpp] [Line: 1178]

Payload was stored in a package trailer, but there no trailer loaded. [Texture2D /Game/Main.Main:PersistentLevel.Landscape_2.Heightmap_0]

UnrealEditor_Core

UnrealEditor_CoreUObject

UnrealEditor_Engine

UnrealEditor_CoreUObject

UnrealEditor_UnrealEd

UnrealEditor_Core

UnrealEditor_Engine

UnrealEditor_UnrealEd

UnrealEditor