Getting a lot of these in the console on unity 2018.1, any one know why?
Assertion failed on expression: ‘(srcInfo.GetChannelMask() & copyChannels) == copyChannels’
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)
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I also get them, but only after I switched to .NET 4.x instead of the default 3.x.
I can’t double click the errors to get to a script, so anyone know how to locate the issue?
Found several more people with the same issue, but still no solution:
Here’s the “full” log:
Assertion failed on expression: '(srcInfo.GetChannelMask() & copyChannels) == copyChannels'
0x00000001415195F8 (Unity) StackWalker::GetCurrentCallstack
0x000000014151FB36 (Unity) StackWalker::ShowCallstack
0x00000001413EFA1B (Unity) GetStacktrace
0x00000001408A1A00 (Unity) DebugStringToFile
0x000000014085F86A (Unity) VertexUtility::CopyChannels
0x000000014080C6F4 (Unity) ExtractMeshComponentArray<Vector3f>
0x000000014083A04C (Unity) CalculateNormalizedLightmapArea
0x000000014082AB19 (Unity) MeshRenderer::GetCachedNormalizedLightmapArea
0x000000014112F585 (Unity) AddInstance
0x0000000141135F98 (Unity) ExtractGIInstances
0x000000014114AF12 (Unity) GISceneManager::GetInstancesWithDuplicates
0x000000014114A9D7 (Unity) GISceneManager::GetInstances
0x000000014114FE6C (Unity) gi::UpdateMaterials
0x000000014114F50E (Unity) GISceneManager::Update
0x0000000141149635 (Unity) `GISceneManager::GISceneManager'::`2'::tickGIInEditorRegistrator::Forward
0x000000014062AC59 (Unity) CallbackArray::Invoke
0x000000014142C77E (Unity) Application::TickTimer
0x00000001415CA465 (Unity) MainMessageLoop
0x00000001415CC7E8 (Unity) WinMain
0x00000001423F8CFA (Unity) __scrt_common_main_seh
0x00007FF90C3F3034 (KERNEL32) BaseThreadInitThunk
0x00007FF90DA41551 (ntdll) RtlUserThreadStart
Oh, workaround has been found:
http://answers.unity.com/answers/1504728/view.html
And just got notified that fix is incoming too:
I found that unchecking Lighting and Reflection Probe under static got rid of these errors.
Essentially I went through each option to see what gave me the errors 
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I get the same error:
Assertion failed on expression: '(srcInfo.GetChannelMask() & copyChannels) == copyChannels'
In 2018.2.1f1 when I manually recompute lighting.
