UE4 crashes immediately when building lights

Hi! Everytime I try to build the lights on my map, UE4 crashes. Does anyone know how to fix it?

I get the following message when it crashes:

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

"Assertion failed: IsValidRef(GBufferResourcesUniformBuffer) [File:c:\users\bolbi\documents\bannermenengine\engine\source\runtime\renderer\private\PostProcess//SceneRenderTargets.h] [Line: 406]

UE4Editor_Core!FDebug::AssertFailed() [c:\users\bolbi\documents\bannermenengine\engine\source\runtime\core\private\misc\outputdevice.cpp:374]
UE4Editor_Renderer!FSceneRenderTargets::GetGBufferResourcesUniformBuffer() [c:\users\bolbi\documents\bannermenengine\engine\source\runtime\renderer\private\postprocess\scenerendertargets.h:408]
UE4Editor_Renderer!FDeferredPixelShaderParameters::Set() [c:\users\bolbi\documents\bannermenengine\engine\source\runtime\renderer\private\postprocess\scenerendertargets.cpp:2382]
UE4Editor_Renderer!FMaterialShader::SetParameters() [c:\users\bolbi\documents\bannermenengine\engine\source\runtime\renderer\private\shaderbaseclasses.cpp:254]
UE4Editor_Renderer!TBasePassPixelShaderBaseType::SetParameters() [c:\users\bolbi\documents\bannermenengine\engine\source\runtime\renderer\private\basepassrendering.h:392]
UE4Editor_Renderer!TBasePassDrawingPolicy::SetSharedState() [c:\users\bolbi\documents\bannermenengine\engine\source\runtime\renderer\private\basepassrendering.h:617]
UE4Editor_Renderer!FDrawBasePassDynamicMeshAction::Process() [c:\users\bolbi\documents\bannermenengine\engine\source\runtime\renderer\private\basepassrendering.cpp:383]
UE4Editor_Renderer!ProcessBasePassMesh() [c:\users\bolbi\documents\bannermenengine\engine\source\runtime\renderer\private\basepassrendering.h:985]
UE4Editor_Renderer!FBasePassOpaqueDrawingPolicyFactory::DrawDynamicMesh() [c:\users\bolbi\documents\bannermenengine\engine\source\runtime\renderer\private\basepassrendering.cpp:444]
UE4Editor_Renderer!FRendererModule::DrawTileMesh() [c:\users\bolbi\documents\bannermenengine\engine\source\runtime\renderer\private\renderer.cpp:80]
UE4Editor_Engine!FTileRenderer::DrawTile() [c:\users\bolbi\documents\bannermenengine\engine\source\runtime\engine\private\tilerendering.cpp:178]
UE4Editor_Engine!FCanvasTileRendererItem::Render_GameThread'::2’::EURCMacro_DrawTileCommand::DoTask() [c:\users\bolbi\documents\bannermenengine\engine\source\runtime\engine\private\tilerendering.cpp:326]
UE4Editor_Engine!TGraphTask<FCanvasTileRendererItem::Render_GameThread'::2’::EURCMacro_DrawTileCommand>::ExecuteTask() [c:\users\bolbi\documents\bannermenengine\engine\source\runtime\core\public\async\taskgraphinterfaces.h:779]
UE4Editor_Core!FTaskThread::ProcessTasks() [c:\users\bolbi\documents\bannermenengine\engine\source\runtime\core\private\async\taskgraph.cpp:539]
UE4Editor_Core!FTaskThread::ProcessTasksUntilQuit() [c:\users\bolbi\documents\bannermenengine\engine\source\runtime\core\private\async\taskgraph.cpp:340]
UE4Editor_RenderCore!RenderingThreadMain() [c:\users\bolbi\documents\bannermenengine\engine\source\runtime\rendercore\private\renderingthread.cpp:310]
UE4Editor_RenderCore!FRenderingThread::Run() [c:\users\bolbi\documents\bannermenengine\engine\source\runtime\rendercore\private\renderingthread.cpp:411]
UE4Editor_Core!FRunnableThreadWin::Run() [c:\users\bolbi\documents\bannermenengine\engine\source\runtime\core\private\windows\windowsrunnablethread.cpp:74]

Thanks for any help!
/Accel.

Hi Accel -

Can you post the Machine ID that appears in the Crash Reporter Window when it pops up? This will help me track down the issue. Also make sure to Submit the Crash or I will not be able to find any information regarding it.

Thank You

Eric Ketchum

Okay, here it is:

MachineId:A9F67DCD421364E5BBE4529BF655D5C5
EpicAccountId:5209c78d43524bf29a8e1ff5dcb54f28

Hi Accel -

This particular crash tracked as UE-25623 looks to be corrected in 4.11 Preview 5 and later.

Thank You

Eric Ketchum