What is the problem of OculusInput and why UE4 crashes?

Hello,

Today it is my first time to install unreal engine 4.18.2 (seems to be preview 5).
When I hit the launch it says bussy and then I get a message saying ‘OculusInput’ is Incompatible
After pressing Yes (evet) or No (hayır), same message pops up. And than nothing happens, UE4 does not open. I could not find any post for this message or error. Are there anyone for had this and solved this issue?

P.S. And I verified the editor two times.