settingsdirectory. It refers to it before booting up and if you have not set it up yet or made some mistakes, Bastion will not be able to start. So, this is a very important step.
credentials.example.yaml. Make a copy of both these files and remove the
.examplepart from the copies. Now, you should have these files inside the
credentials.yamlfiles to add (or edit) the configurations and credentials of Bastion, respectively. And after you do that, save the files.