Problem with initialising project

Hello! Confirming I have the same issue this morning! I followed the sets in the project description and video.
I am running with ddev if that helps, otherwise it's a relatively fresh install of Drupal 10.2.4

I think I had this error before doing
drush role:perm:add anonymous 'render storybook stories'

@dgroene:
I've checked and rechecked, done a clean install and made sure the permissions were set. But it doesn't change anything in the outcome.

I've got mine working now. I've created a new, clean setup (using Lando) and now it works. The only difference with regards to project structure is that I have created a subfolder 'drupal' like in the tutorial instead of my usual workflow. In one way or the other, it seems like Storybook couldn't find the stories in the old setup. I'll keep on checking what the difference is, but for now: it works as designed.

Old (not working):
/projectname/.storybook
/projectname/.yarn
/projectname/web
/projectname/vendor
/projectname/.lando.yml

New (working):
/projectname/drupal/.storybook
/projectname/drupal/.yarn
/projectname/drupal/vendor
/projectname/drupal/web
/projectname/.lando.yml

Just another debug hint: check the console for errors. I've just encountered the same error with my environment that was working earlier. In my case it was a CORS error (development.services.yml was overwritten).

For anyone else who makes their way here, my issue is that core-composer-scaffold was overwriting my development.services.yml file any time I added a new required package. I added the following to my composer.json to prevent this:

  "extra": {
    // ...
    "drupal-scaffold": {
      // ...
      "file-mapping": {
        "[web-root]/sites/development.services.yml": false
      }
    }
  }