Mattermost can't be started Invalid Configuration

[KolbeinNL]

I have pulled the project. Done all the steps in the README and ended up with:

Error: failed to load configuration: failed to create store: unable to load on store creation: invalid config: Config.IsValid: model.config.is_valid.site_url.app_error

Usage: mattermost | mattermost [flags] mattermost | mattermost [command] mattermost | mattermost | Available Commands: mattermost | channel Management of channels mattermost | command Management of slash commands

...

Maybe the README is missing a step. Do I need a default configuration file somewhere? My .env is configured just the way described in the README.

[oli-ver]

I faced the same issue and found I needed to update docker-compose, see:

https://github.com/mattermost/docker/issues/41#issuecomment-996866739

After that it worked.