Missing extension

I get this on every “Content” view instead of “Publish” (and related actions) in sidebar:

<some uuid> is saved in configuration, but not installed in this environment.

Everything worked as expected last week. We don’t have any extensions, content models are built using basic text/image elements.

Any idea what’s wrong with our Space/Configuration?

The most probable reasons is: the UI extension has been deleted, but still not removed in the content type settings. Please follow these steps to remove it:

  • visit the content type of this entry (Content Type ID can be found by clicking on “INFO” in the entry)
  • click on “sidebar”
  • remove the deleted extension