At first look, I assume it would be something to do with running on Windows? This is often a problem with any Docker container as how file paths are written is different (Linux uses / to separate folders, whereas Windows uses \).
Another user has posted a quite detailed post about how they got it running in Windows:
The first thing though before we can provide any more info is that if you changed things in the Dockerfile, docker-compose.yml, or the ors app.config file, all of those could cause problems with reading files.