Unreal editor 4.7.1 crash on startup

Whenever I load the unreal engine through the epics games launcher, the ‘initializing’ bar gets to 59% and then freeze, it then crashes with this message:


MachineId:677810B34D18C1C7DE833E950E28AE10
EpicAccountId:4fa43ef94d3c49d48cc0619b19792135

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

Assertion failed: InCompressedData != NULL [File:D:\BuildFarm\buildmachine_++depot+UE4-Releases+4.7\Engine\Source\Developer\ImageWrapper\Private\ImageWrapperBase.cpp] [Line: 69]

KERNELBASE + 37901 bytes
UE4Editor_Core!FOutputDeviceWindowsError::Serialize() + 292 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\core\private\windows\windowsplatformoutputdevices.cpp:95]
UE4Editor_Core!FOutputDevice::Logf__VA() + 248 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\core\private\misc\outputdevice.cpp:144]
UE4Editor_Core!FDebug::AssertFailed() + 1079 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\core\private\misc\outputdevice.cpp:224]
UE4Editor_ImageWrapper!FImageWrapperBase::SetCompressed() + 78 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\developer\imagewrapper\private\imagewrapperbase.cpp:70]
UE4Editor_ImageWrapper!FPngImageWrapper::SetCompressed() + 14 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\developer\imagewrapper\private\pngimagewrapper.cpp:167]
UE4Editor_SlateRHIRenderer!FSlateRHIResourceManager::LoadTexture() + 255 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\slaterhirenderer\private\slaterhiresourcemanager.cpp:264]
UE4Editor_SlateRHIRenderer!FSlateRHIResourceManager::LoadTexture() + 114 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\slaterhirenderer\private\slaterhiresourcemanager.cpp:244]
UE4Editor_SlateRHIRenderer!FSlateRHIResourceManager::CreateTextures() + 1142 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\slaterhirenderer\private\slaterhiresourcemanager.cpp:207]
UE4Editor_SlateRHIRenderer!FSlateRHIRenderer::Initialize() + 94 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\slaterhirenderer\private\slaterhirenderer.cpp:152]
UE4Editor_Slate!FSlateApplication::InitializeRenderer() + 226 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:749]
UE4Editor!FEngineLoop::PreInit() + 10112 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\launch\private\launchengineloop.cpp:1348]
UE4Editor!GuardedMain() + 251 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\launch\private\launch.cpp:110]
UE4Editor!GuardedMainWrapper() + 26 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\launch\private\windows\launchwindows.cpp:126]
UE4Editor!WinMain() + 249 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\launch\private\windows\launchwindows.cpp:202]
UE4Editor!__tmainCRTStartup() + 329 bytes [f:\dd\vctools\crt\crtw32\dllstuff\crtexe.c:618]


It ran fine before, however I have updated the engine and now it does not work. I am not trying to load any specific file, just clicking the ‘launch unreal engine 4.7.1’ button in the epic games launcher.

Hey Doxturtle,

Have you tried installing a newer version of the Engine from the Launcher? If so, does that version of the Engine actually open for you? Also, could you please go to where your engine is installed and try to run the UE4Editor.exe? It should be located within these folders: Epic Games\4.7\Engine\Binaries\Win64

Looking forward to hearing from you, thanks!

Hey DoxTurtle,

I have not heard from you since your initial post and for that reason, I must mark your question as resolved. If you have any further questions or concerns regarding this specific question or topic, please reply back and we will assist you further.

Thank you and have a great day!