# OpenGL Errors using ActiViz for Unity
**URL:** https://discourse.vtk.org/t/opengl-errors-using-activiz-for-unity/4503
**Category:** Support
**Created:** [October 28, 2020, 9:18am UTC](https://discourse.vtk.org/t/opengl-errors-using-activiz-for-unity/4503 "2020-10-28T09:18:25Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@drdavid](https://discourse.vtk.org/u/drdavid)
#### Post date: [October 28, 2020, 9:18am UTC](https://discourse.vtk.org/t/opengl-errors-using-activiz-for-unity/4503/1 "2020-10-28T09:18:25Z")
Hi all. I’ve a fair bit of experience using Activiz 7.1.1 and separately with Unity3D and now looking at using the Unity3D plugin. I’ve downloaded the Medical Viewer sample package and also have a trial of the full plugin. Despite following the instructions carefully, testing on Unity 2018, 2019 and 2020 is giving me:
OPENGL NATIVE PLUG-IN ERROR: GL\_INVALID\_OPERATION: Operation illegal in current state
0x00007FF6A1CD36FC (Unity) StackWalker::GetCurrentCallstack
0x00007FF6A1CD7721 (Unity) StackWalker::ShowCallstack
0x00007FF6A2F4DBC5 (Unity) GetStacktrace
0x00007FF6A3DF628E (Unity) DebugStringToFile
0x00007FF6A0C09967 (Unity) LogGLES
0x00007FF6A0C07A81 (Unity) CheckErrorGLES
0x00007FF6A0C0EC09 (Unity) GfxDeviceGLES::AfterPluginRender
0x00007FF6A3AF6690 (Unity) GfxDeviceWorker::RunCommand
0x00007FF6A3AFE03C (Unity) GfxDeviceWorker::RunExt
0x00007FF6A3AFE428 (Unity) GfxDeviceWorker::RunGfxDeviceWorker
0x00007FF6A19B96E0 (Unity) Thread::RunThreadWrapper
0x00007FFE8E467C24 (KERNEL32) BaseThreadInitThunk
0x00007FFE8F76CEA1 (ntdll) RtlUserThreadStart
I see a similar closed topic at: [How to integrate VTK with Unity](https://discourse.vtk.org/t/how-to-integrate-vtk-with-unity/1108) but there was never a solution posted that I can see.
Many thanks in advance.
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### Author:  [@Michael](https://discourse.vtk.org/u/Michael)
#### Post date: [October 29, 2020, 10:03am UTC](https://discourse.vtk.org/t/opengl-errors-using-activiz-for-unity/4503/2 "2020-10-29T10:03:29Z")
@LucasGandel