Assertion failed, I cannot open the CryptRaider project anymore

[Kelembor_Bhaal]

Everything worked fine until yesterday.
I finished the character blueprint and the lights, build ‘only lightning’ as some red error showed on screen when I played (that fixed it), saved all and then closed Unreal.
Today Unreal crashes when I try to open the project.

Things I’ve already tried:

• I can open other projects just fine.
• Deleted DerivedDataCache, Intermediate and Saved from the project folder.
• Deleted DerivedDataCache, Intermediate and Saved from the AppData/Local/UnrealEngine/5.1 folder.

Here’s the log:

CrypRider.log ($2530084) · Snippets · GitLab

I cannot .zip the project as I cannot open it

Help me please!

[DanM]

Since that’s coming from the renderer have you tried updating your GPU drivers?

[Kelembor_Bhaal]

I just did and it worked, I am able to open the project again, thank you very much. I’ve just done a backup copy from the whole project folder and .zip it.

BUT…
Something is wrong with my chandeliers. I created a BP class with the chandelier mesh and added a light source, just like the torch.
Changing the intensity and attenuation radius is what causes this error:

DumpUnbuiltLightInteractions ($2530607) · Snippets · GitLab

Then I click ‘Build only lightning’ and the light from those chandeliers disappear.

If I save all and close, once I try to open the project the ‘Assertion Failed’ error pops up again and I’m unnable to open it. Something is wrong with the lightning and the renderer for sure.

Here’s my project, maybe you can find what’s wrong:

2.12 GB file on MEGA

[DanM]

@Kelembor_Bhaal

Changing the intensity and attenuation radius is what causes this error:

Just to note: that’s not an “error”, it’s just telling you the scene has changed so the lighting needs to be rebuilt as what you’re currently looking does not represent of the changes made.

However when I try to build that I get

<None> === Lightmass crashed: ===
Assertion failed: BlendMode != BLEND_Opaque && BlendMode != BLEND_Masked [File:D:\build\++UE5\Sync\Engine\Source\Programs\UnrealLightmass\Private\ImportExport\Material.cpp] [Line: 46] 

0x00007ff684133944 UnrealLightmass.exe!Lightmass::FMaterial::Import() []
0x00007ff684102d19 UnrealLightmass.exe!Lightmass::FLightmassImporter::ConditionalImportObjectWithKey<Lightmass::FMaterial,TMap<Lightmass::FSHAHash,Lightmass::FMaterial * __ptr64,FDefaultSetAllocator,TDefaultMapHashableKeyFuncs<Lightmass::FSHAHash,Lightmass::FMaterial * __ptr64,0> >,Lightmass::FSHAHash>() []
0x00007ff684136e52 UnrealLightmass.exe!Lightmass::FStaticLightingMesh::Import() []
0x00007ff684199b1d UnrealLightmass.exe!Lightmass::FStaticMeshStaticLightingMesh::Import() []
0x00007ff6841061f6 UnrealLightmass.exe!Lightmass::FLightmassImporter::ImportObjectArray<Lightmass::FStaticMeshStaticLightingMesh,TMap<FGuid,Lightmass::FStaticMeshStaticLightingMesh * __ptr64,FDefaultSetAllocator,TDefaultMapHashableKeyFuncs<FGuid,Lightmass::FStaticMeshStaticLightingMesh * __ptr64,0> > >() []
0x00007ff6841353ba UnrealLightmass.exe!Lightmass::FScene::Import() []
0x00007ff684119e8f UnrealLightmass.exe!Lightmass::BuildStaticLighting() []
0x00007ff68413f461 UnrealLightmass.exe!Lightmass::LightmassMain() []
0x00007ff684160e37 UnrealLightmass.exe!main() []
0x00007ff6841cf11c UnrealLightmass.exe!__scrt_common_main_seh() []
0x00007ff8d8577604 KERNEL32.DLL!UnknownFunction []
0x00007ff8da2026a1 ntdll.dll!UnknownFunction []



0x00007ff684133944 UnrealLightmass.exe!Lightmass::FMaterial::Import() []
0x00007ff684102d19 UnrealLightmass.exe!Lightmass::FLightmassImporter::ConditionalImportObjectWithKey<Lightmass::FMaterial,TMap<Lightmass::FSHAHash,Lightmass::FMaterial * __ptr64,FDefaultSetAllocator,TDefaultMapHashableKeyFuncs<Lightmass::FSHAHash,Lightmass::FMaterial * __ptr64,0> >,Lightmass::FSHAHash>() []
0x00007ff684136e52 UnrealLightmass.exe!Lightmass::FStaticLightingMesh::Import() []
0x00007ff684199b1d UnrealLightmass.exe!Lightmass::FStaticMeshStaticLightingMesh::Import() []
0x00007ff6841061f6 UnrealLightmass.exe!Lightmass::FLightmassImporter::ImportObjectArray<Lightmass::FStaticMeshStaticLightingMesh,TMap<FGuid,Lightmass::FStaticMeshStaticLightingMesh * __ptr64,FDefaultSetAllocator,TDefaultMapHashableKeyFuncs<FGuid,Lightmass::FStaticMeshStaticLightingMesh * __ptr64,0> > >() []
0x00007ff6841353ba UnrealLightmass.exe!Lightmass::FScene::Import() []
0x00007ff684119e8f UnrealLightmass.exe!Lightmass::BuildStaticLighting() []
0x00007ff68413f461 UnrealLightmass.exe!Lightmass::LightmassMain() []
0x00007ff684160e37 UnrealLightmass.exe!main() []
0x00007ff6841cf11c UnrealLightmass.exe!__scrt_common_main_seh() []
0x00007ff8d8577604 KERNEL32.DLL!UnknownFunction []
0x00007ff8da2026a1 ntdll.dll!UnknownFunction []

Not quite sure what’s going on honestly.

[Kelembor_Bhaal]

Just to note: that’s not an “error”, it’s just telling you the scene has changed so the lighting needs to be rebuilt as what you’re currently looking does not represent of the changes made

Ops, sorry. I should have said “warning” maybe, noted.

Not quite sure what’s going on honestly.

I’ve been searching in forums, Reddit, everywhere… yet I have no clue what’s going on, it’s strange since the other lighting sources works properly.
I can understand to find an error or something like that, but not being able to open the whole project because of that Assertion failed it’s really annoying. At least I have a backup copy now to keep up with the course.