We will need the files found in the folder, the error mentions. To find it right click your game in the Steam library, select Properties, go to the Local Files tab and select Browse local files. We will need both the error.log and the output_log.txt (called player.log on Mac or Linux).
As we can't attach files here on Steam, you will need to upload the file somewhere else. Here's a few sites you can upload it to, which do not require you to sign up first:
https://uploadfiles.io/ - free, no sign-up, can handle large log files
https://paste.ee/ - fast, no sign-up required (some log files will be too large for it though)
https://zerobin.net/ - bit clunky, but can handle huge files, no sign-up required