Unhandled vertex structure for strided buffers! UnityEditor.DockArea:OnGUI()

Have you seen that before ? I was trying to add occlusion culling , and got all the models to make them static … but i got this error
Unhandled vertex structure for strided buffers!
UnityEditor.DockArea:OnGUI()
and this below
vertexSize != stride
UnityEditor.DockArea:OnGUI()
do you know what does that mean?

File bug report pretty please with repro project

Thanks Alexey,
I tried but it fails all the time. The project is 1 gb and after an hour or more it says that file uploading failed.
I will make a copy of the project and try to strip it down …The project is a 2.6 project and changed the shaders and some thinks that didn’t work properly … but i think that there are some corrupt metadata or stuff like that … I will try again.
.a