Error after click Build

Development Platform & Builds
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1

Hi!

When click “Build”, show dialog, progress bar after error and crash:

Assertion failed: &Swarm != NULL [File:C:\UnrealEngine 4.3.0\Engine\Source\Editor\UnrealEd\Private\Lightmass\Lightmass.cpp] [Line: 2224]

Stack:
FWindowsPlatformStackWalk::StackWalkAndDump() 0xf31ae826 + 0 bytes [File=c:\unrealengine 4.3.0\engine\source\runtime\core\private\windows\windowsplatformstackwalk.cpp:177] [in E:\Program Files (x86)\Unreal Engine 4.3.0\Unreal Engine\Engine\Binaries\Win64\UE4Editor-Core.dll]
FDebug::AssertFailed() 0xf304a825 + 0 bytes [File=c:\unrealengine 4.3.0\engine\source\runtime\core\private\misc\outputdevice.cpp:203] [in E:\Program Files (x86)\Unreal Engine 4.3.0\Unreal Engine\Engine\Binaries\Win64\UE4Editor-Core.dll]
FLightmassProcessor::FLightmassProcessor() 0xea158560 + 39 bytes [File=c:\unrealengine 4.3.0\engine\source\editor\unrealed\private\lightmass\lightmass.cpp:2224] [in E:\Program Files (x86)\Unreal Engine 4.3.0\Unreal Engine\Engine\Binaries\Win64\UE4Editor-UnrealEd.dll]
FStaticLightingSystem::CreateLightmassProcessor() 0xea1cfb9a + 40 bytes [File=c:\unrealengine 4.3.0\engine\source\editor\unrealed\private\staticlightingsystem\staticlightingsystem.cpp:1681] [in E:\Program Files (x86)\Unreal Engine 4.3.0\Unreal Engine\Engine\Binaries\Win64\UE4Editor-UnrealEd.dll]
FStaticLightingSystem::BeginLightmassProcess() 0xea1cc743 + 8 bytes [File=c:\unrealengine 4.3.0\engine\source\editor\unrealed\private\staticlightingsystem\staticlightingsystem.cpp:560] [in E:\Program Files (x86)\Unreal Engine 4.3.0\Unreal Engine\Engine\Binaries\Win64\UE4Editor-UnrealEd.dll]
FStaticLightingManager::CreateStaticLightingSystem() 0xea1cffd0 + 0 bytes [File=c:\unrealengine 4.3.0\engine\source\editor\unrealed\private\staticlightingsystem\staticlightingsystem.cpp:210] [in E:\Program Files (x86)\Unreal Engine 4.3.0\Unreal Engine\Engine\Binaries\Win64\UE4Editor-UnrealEd.dll]
UEditorEngine::BuildLighting() 0xea1cc96e + 63 bytes [File=c:\unrealengine 4.3.0\engine\source\editor\unrealed\private\staticlightingsystem\staticlightingsystem.cpp:2114] [in E:\Program Files (x86)\Unreal Engine 4.3.0\Unreal Engine\Engine\Binaries\Win64\UE4Editor-UnrealEd.dll]
FEditorBuildUtils::EditorBuild() 0xe9ac68b8 + 0 bytes [File=c:\unrealengine 4.3.0\engine\source\editor\unrealed\private\editorbuildutils.cpp:330] [in E:\Program Files (x86)\Unreal Engine 4.3.0\Unreal Engine\Engine\Binaries\Win64\UE4Editor-UnrealEd.dll]
TBaseStaticDelegateInstance_NoParams::ExecuteIfSafe() 0xe0773f5a + 0 bytes [File=c:\unrealengine 4.3.0\engine\source\runtime\core\public\delegates\delegateinstancesimpl.inl:690] [in E:\Program Files (x86)\Unreal Engine 4.3.0\Unreal Engine\Engine\Binaries\Win64\UE4Editor-LevelEditor.dll]
FUICommandList::ExecuteAction() 0xeaac80b6 + 60 bytes [File=c:\unrealengine 4.3.0\engine\source\runtime\slate\private\framework\commands\uicommandlist.cpp:110] [in E:\Program Files (x86)\Unreal Engine 4.3.0\Unreal Engine\Engine\Binaries\Win64\UE4Editor-Slate.dll]
SToolBarButtonBlock::OnClicked() 0xeab82a3d + 0 bytes [File=c:\unrealengine 4.3.0\engine\source\runtime\slate\private\framework\multibox\stoolbarbuttonblock.cpp:293] [in E:\Program Files (x86)\Unreal Engine 4.3.0\Unreal Engine\Engine\Binaries\Win64\UE4Editor-Slate.dll]
TBaseSPMethodDelegateInstance_RetVal_NoParams::Execute() 0xeab6b7dc + 17 bytes [File=c:\unrealengine 4.3.0\engine\source\runtime\core\public\delegates\delegateinstancesimpl.inl:161] [in E:\Program Files (x86)\Unreal Engine 4.3.0\Unreal Engine\Engine\Binaries\Win64\UE4Editor-Slate.dll]
TBaseDelegate_RetVal_NoParams::Execute() 0xeacc2cfa + 6 bytes [File=c:\unrealengine 4.3.0\engine\source\runtime\core\public\delegates\delegatesignatureimpl.inl:1058] [in E:\Program Files (x86)\Unreal Engine 4.3.0\Unreal Engine\Engine\Binaries\Win64\UE4Editor-Slate.dll]
SButton::OnMouseButtonUp() 0xeace3ba9 + 17 bytes [File=c:\unrealengine 4.3.0\engine\source\runtime\slate\private\widgets\input\sbutton.cpp:188] [in E:\Program Files (x86)\Unreal Engine 4.3.0\Unreal Engine\Engine\Binaries\Win64\UE4Editor-Slate.dll]
FSlateApplication::ProcessMouseButtonUpEvent() 0xeaaf5f99 + 23 byte

Please help

2

Hey PanKamil897 -

Let’s start by resetting the Swarm Cache and make sure we haven’t got bad data stored. Ensure that your editor and Launcher are closed and then go to C:\Users[User Name]\AppData\Local\UnrealEngine\4.3\Saved\Swarm\SwarmCache\ and delete all the files in this folder. Re-open your editor and project and attempt to build lighting again.

Let me know -

Eric Ketchum

EDIT

We have not heard back from you in a few days, so we are marking this post as Resolved for tracking purposes. If you are still experiencing the issue you reported, please respond to this message with additional information and we will offer further assistance.

Thank you.

Eric Ketchum