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Editor crashes on startup with Oculus, on existing project

I've been developing a Vive game using UE4 for over an year now, and I just got an Oculus Rift and wanted to port the game to that headset, so I unplugged the Vive and plugged the Rift, restarted my PC so that Unreal would stop trying to launch with SteamVR, but now, even though Oculus home is launched while the project loads, as soon as it reaches 100%, the editor crashes with this message.

Assertion failed: ModuleManager.IsModuleLoaded(ModuleName) [File:D:\Build++UE4+Release-4.15+Compile\Sync\Engine\Source\Runtime\Core\Public\Modules/ModuleManager.h] [Line: 258] Tried to get module interface for unloaded module: 'LevelEditor'

UE4Editor_Core!FDebug::AssertFailed() [d:\build++ue4+release-4.15+compile\sync\engine\source\runtime\core\private\misc\assertionmacros.cpp:349] UE4Editor_UnrealEd!FModuleManager::GetModuleChecked() [d:\build++ue4+release-4.15+compile\sync\engine\source\runtime\core\public\modules\modulemanager.h:258] UE4Editor_UnrealEd!UEditorEngine::GetActiveViewport() [d:\build++ue4+release-4.15+compile\sync\engine\source\editor\unrealed\private\playlevel.cpp:3475] UE4Editor_OculusRift!FOculusRiftHMD::FindSceneViewport() [d:\build++ue4+release-4.15+compile\sync\engine\plugins\runtime\oculusrift\source\oculusrift\private\oculusrifthmd.cpp:1364] UE4Editor_OculusRift!FOculusRiftHMD::DoEnableStereo() [d:\build++ue4+release-4.15+compile\sync\engine\plugins\runtime\oculusrift\source\oculusrift\private\oculusrifthmd.cpp:1382] UE4Editor_Engine!UEngine::InitializeHMDDevice() [d:\build++ue4+release-4.15+compile\sync\engine\source\runtime\engine\private\unrealengine.cpp:2210] UE4Editor_Engine!UEngine::Init() [d:\build++ue4+release-4.15+compile\sync\engine\source\runtime\engine\private\unrealengine.cpp:873] UE4Editor_UnrealEd!UEditorEngine::InitEditor() [d:\build++ue4+release-4.15+compile\sync\engine\source\editor\unrealed\private\editorengine.cpp:557] UE4Editor_UnrealEd!UEditorEngine::Init() [d:\build++ue4+release-4.15+compile\sync\engine\source\editor\unrealed\private\editorengine.cpp:846] UE4Editor_UnrealEd!UUnrealEdEngine::Init() [d:\build++ue4+release-4.15+compile\sync\engine\source\editor\unrealed\private\unrealedengine.cpp:75] UE4Editor!FEngineLoop::Init() [d:\build++ue4+release-4.15+compile\sync\engine\source\runtime\launch\private\launchengineloop.cpp:2513] UE4Editor_UnrealEd!EditorInit() [d:\build++ue4+release-4.15+compile\sync\engine\source\editor\unrealed\private\unrealedglobals.cpp:76] UE4Editor!GuardedMain() [d:\build++ue4+release-4.15+compile\sync\engine\source\runtime\launch\private\launch.cpp:150] UE4Editor!GuardedMainWrapper() [d:\build++ue4+release-4.15+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:134] UE4Editor!WinMain() [d:\build++ue4+release-4.15+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:210] UE4Editor!__scrt_common_main_seh() [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:264] kernel32 ntdll

It seems like the engine can't load the level editor (the main window) because of the Oculus, for some reason. The weird thing is, however, I created a new project using the VR template, and I can load and preview the game just fine.

Product Version: UE 4.15
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asked May 03 '17 at 05:17 PM in VR

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Ok I found out the answer. It's a bit odd. Here's the issue. The problem occurs when the project is set to play in VR AND you've disabled the Paper 2D plugin. I disabled it cause I wasn't using it. If you've disabled it and can no longer open your project, either use your source control to roll-back changes to your .uproject file or directly edit it's plugin configuration, where Paper2D is listed set enabled to true.

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answered May 03 '17 at 06:16 PM

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avatar image lordmatthoffman Jun 24 '17 at 06:30 PM

Cheers, this suddenly got me and I forgot I had just enabled bStartInVR. UE-42791 is still an issue in 4.16 with Launcher version, doh!

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