why is this project crashing on start up?

I have done literally everything, restart, reinstall, even the weird things like unplug x box controller, delete appdata… But Unity still crashes overtime I open this one project with a window popping up with the unity logo in the middle with a big red exclamation mark. Although I recently made some changes to the Photon Network scripts I’ve done similar things before with no crashes. Iv’e submitted a ticket in the meantime but does anybody have any ideas? unity 2019.2.13f1

ticket got a replay saying upgrade to the latest stable verion of unity. I did, updated my project and fixed the problem