Unreal Engine project crashes on startup

Development Programming & Scripting Blueprint
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1

Assertion failed: !HasAnyFlags(RF_NeedPostLoad) [File:D:\build++UE5\Sync\Engine\Source\Runtime\Engine\Private\Materials\MaterialInstance.cpp] [Line: 2444]

This message shows up when I try to start my project. I don’t know what’s causing the issue or how to find it.

2

Seems your project is crashing while building shaders

void UMaterialInstance::CacheShadersForResources(EShaderPlatform ShaderPlatform, const TArray<FMaterialResource*>& ResourcesToCache, EMaterialShaderPrecompileMode PrecompileMode, const ITargetPlatform* TargetPlatform)
{
	UMaterial* BaseMaterial = GetMaterial();
#if WITH_EDITOR
	check(!HasAnyFlags(RF_NeedPostLoad));
	check(BaseMaterial!=nullptr && !BaseMaterial->HasAnyFlags(RF_NeedPostLoad));
	UpdateCachedData();
// more code.....



Remarks

Caches shader maps for an array of material resources.

Try this solution: