4.10 project crashes in 4.12

Hello, we’re having a problem playing our project after we updated Unreal Engine 4.10 to 4.12.3. Each time we click on button play, Unreal Engine crashes. We updated Unreal Engine because in older versions we couldn’t play our project with Oculus Rift DK2. We tried creating a template in 4.10 and then playing it in 4.12 with Oculus and it works, but our project still seems to be a problem.

Does anyone has an idea why does it crash and how we could fix it?
Thank you all in advance :slight_smile: