In drupal8 we use config / sync setup. I check out Feature / Branch, add a module (asset_injector) via Composer, enable it, change the module settings, export the configuration and check in git and push.
Now I switch to Master Branch, Pull, Import Config and Composer Update.
In EntityTypeManager.php line 133: The entity type "asset_injector_css" does not exist.
What is the problem here? Many Thanks.