Crash after update from 4.10 preview 2 to preview 3

I was working fine on version 4.10 preview 2. Than after update to 4.10 preview 3 i can’t open my project:

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

"Assertion failed: IOculusRiftPlugin::IsAvailable() [File:D:\BuildFarm\buildmachine_++depot+UE4-Releases+4.10\Engine\Plugins\Runtime\OculusInput\Source\Private\OculusInput.cpp] [Line: 128]

UE4Editor_Core!FDebug::AssertFailed() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\core\private\misc\outputdevice.cpp:374]
UE4Editor_Core!FWindowsApplication::PollGameDeviceState() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\core\private\windows\windowsapplication.cpp:1789]
UE4Editor_Slate!FSlateApplication::PollGameDeviceState() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:1209]
UE4Editor!FEngineLoop::Tick() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\launch\private\launchengineloop.cpp:2417]
UE4Editor!GuardedMain() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\launch\private\launch.cpp:142]
UE4Editor!GuardedMainWrapper() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\launch\private\windows\launchwindows.cpp:126]
UE4Editor!WinMain() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\launch\private\windows\launchwindows.cpp:200]
UE4Editor!__scrt_common_main_seh() [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:264]

Try disable plugins: Oculus Input, Oculus Library, Oculus Rift.

i added this lines to .uproject file (to disable “OculusInput” and “OculusLibrary”, the others were already disabled) and the project is opening again :

“Name”: “OculusInput”,
“Enabled”: false
“Name”: “OculusLibrary”,
“Enabled”: false

Hello carf,

I was unable to reproduce this crash on our end. I have few questions for you that will help narrow down what issue it is that you are experiencing.

Quick questions:

  1. Can you reproduce this issue in a clean project?
  2. If so could you provide a detailed list of steps to reproduce this issue on our end?
  3. Does this crash occur when the editor is restarted after disabling the plugins?
  4. Do you have an oculus connected to your computer when the crash occurs?

Hello Rudy,

You can reproduce this way:

  • Create a new project.
  • Disable all the Virtual reality plugins (except Oculus Input and Oculus Library
  • Restart

UE can’t handle when Oculus Rift is disabled and Oculus Library and/or Oculus Input are Enabled.


I was able to reproduce this issue on our end. I have written up a report ( UE-22744) and I have submitted it to the developers for further consideration. I will provide updates with any pertinent information as it becomes available. Thank you for your time and information.

Make it a great day