Project fails loading 4.10.2

Hello

I saved my project without issues last night. Trying to reopen it this morning, it just wouldn’t work.
Here is the crash report : (long paste folowws)

Unknown exception - code 00000001 (first/second chance not available)

"Fatal error: [File:D:\BuildFarm\buildmachine_++depot+UE4-Releases+4.10\Engine\Source\Runtime\Renderer\Private\ShaderBaseClasses.cpp] [Line: 158]
TBasePassVSTLightMapPolicyHQ

UE4Editor_Core!FDebug::AssertFailed() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\core\private\misc\outputdevice.cpp:374]
UE4Editor_Renderer!FMaterialShader::SetParameters() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\renderer\private\shaderbaseclasses.cpp:131]
UE4Editor_Renderer!TBasePassVertexShaderBaseType >::SetParameters() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\renderer\private\basepassrendering.h:78]
UE4Editor_Renderer!TBasePassDrawingPolicy >::SetSharedState() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\renderer\private\basepassrendering.h:588]
UE4Editor_Renderer!TStaticMeshDrawList > >::DrawElement() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\renderer\private\staticmeshdrawlist.inl:86]
UE4Editor_Renderer!TStaticMeshDrawList > >::DrawVisibleInner() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\renderer\private\staticmeshdrawlist.inl:279]
UE4Editor_Renderer!FDeferredShadingSceneRenderer::RenderBasePassStaticDataDefault() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\renderer\private\deferredshadingrenderer.cpp:246]
UE4Editor_Renderer!FDeferredShadingSceneRenderer::RenderBasePassStaticData() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\renderer\private\deferredshadingrenderer.cpp:382]
UE4Editor_Renderer!FDeferredShadingSceneRenderer::RenderBasePassView() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\renderer\private\deferredshadingrenderer.cpp:589]
UE4Editor_Renderer!FDeferredShadingSceneRenderer::RenderBasePass() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\renderer\private\deferredshadingrenderer.cpp:1684]
UE4Editor_Renderer!FDeferredShadingSceneRenderer::Render() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\renderer\private\deferredshadingrenderer.cpp:1037]
UE4Editor_Renderer!RenderViewFamily_RenderThread() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\renderer\private\scenerendering.cpp:1582]
UE4Editor_Renderer!TGraphTask<FRendererModule::BeginRenderingViewFamily'::20’::EURCMacro_FDrawSceneCommand>::ExecuteTask() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\core\public\async\taskgraphinterfaces.h:779]
UE4Editor_Core!FTaskThread::ProcessTasks() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\core\private\async\taskgraph.cpp:539]
UE4Editor_Core!FTaskThread::ProcessTasksUntilQuit() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\core\private\async\taskgraph.cpp:340]
UE4Editor_RenderCore!RenderingThreadMain() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\rendercore\private\renderingthread.cpp:310]
UE4Editor_RenderCore!FRenderingThread::Run() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\rendercore\private\renderingthread.cpp:411]
UE4Editor_Core!FRunnableThreadWin::Run() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\core\private\windows\windowsrunnablethread.cpp:74]

There is no problem when :

  • launching the editor without any project
  • openning other basic (template FPS saved to new project a few days ago)
  • creating a new project.

Here is what esle I tried and failed with the incriminated project :

  • updating graphic drivers
  • removing temp / saved files from the project

But opening (without converting) the project in UE 4.11.0 Preview 4 worked : the project opened and the shaders were built.

Closing (without saving) and trying to reopen the project in 4.10.2 didn’t help - it still hangs at 96% with the same crash log

My main issue : I have to deliver a 4.10 version of the project map

Is there anyway to resolve this situation with 4.10.2 ?

Thanks in advance - RyF

Hi RyF,

I have a couple of suggestions which may help resolve your issue. Firstly, we have a helpful set of instructions to follow when reporting a crash or a bug that helps our team effectively troubleshoot users issues. Take a look at the How to Report a Bug post so you can get an idea of the information we will request from you when gathering the items to create a bug report.

  • Try going into your project folder and deleting the DDC folder. This holds information like your locally compiled shaders.
  • When opening your project and it hangs at 96%, bring up your task manager (Ctrl+Alt+Delete) and move to the ‘Processes’ tab. Check to make sure your project is actually no longer processing.

Do you remember any of the most recent changes to you made to your project before closing and saving last night?

Let me know if you have further questions.

Cheers,