Cannot start the engine any more

I was installing megascans materials and after they didn’t showed up in my scene, I thought it could help to restart the engine. But after closing it the engine don’t starts any more. It initializes till 74% and then closes. Even a restart of the PC didn’t help. Any idea how to solve this?

Check out the log file that’s located in the Saved folder of your project. You could also try to delete these materials from the file explorer and see if it helps (make a backup first if you’re going to do that).

Thank you for your quick answer. I don’t really understand the log file. The new downloaded materials don’t show up in the content folder of the project, but in the log file there are files declared as missing, which aren’t missing. I’ll reinstall Quixel Bridge. Maybe this helps.