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nilesh.addweb → made their first commit to this issue’s fork.

I have updated the configuration forms, please review MR.

I had the same issue. The underlying error was:

php.ERROR: InvalidArgumentException: Class "\Drupal\fastly\Form\FastlySettingsForm" does not exist. in Drupal\Core\DependencyInjection\ClassResolver->getInstanceFromDefinition()

Applying Nilesh's patch fixed it for me.

Alright tell me when this is applied to 4.0.4 and pushed out so I can update my site to test it.