Third Party, Protected - akeeba/onthos GitHub Wiki

This third party extension is Protected, meaning it cannot be uninstalled. This is highly unusual, and most likely a mistake.

Why is it a problem?

Protected extensions cannot be uninstalled. This is an attributed normally reserved for core Joomla extensions which must never be removed from your site, such as the user manager (com_users).

A third party extension which can never be uninstalled is, by definition, a mistake. Third party extensions must always be possible to install, update, and uninstall.

Suggested fix

Onthos lets you unprotect the extension.