Plesk

The problem should be solved by plugin update (update instruction).

To fix this problem, enable PHP for that particular website (or in its used service plan).

Site.pro provides plugin for Plesk 12 and higher (Plesk Onyx, Plesk Obsidian and higher). See installation instruction.

To solve this problem, please re-install the plugin on your Plesk server by downloading new plugin from your license that you use on Site.pro. It will bring back your icon and title and the plugin overwriting should never happen again.

Please note that this action is absolutely safe - it will not affect clients websites.

The website builder requires Passive FTP Mode to be enabled on your server in order to publish websites.

Please refer to this official article from Plesk on how to configure Passive FTP Mode.

This problem can appear when using brand of On-Premises type and having website builder installed on your server.

• The problem can be caused by website builder plugin on Plesk having wrong website builder domain saved inside it and, therefore, when calling it — plugin throws error 404 not found. To fix the problem, update plugin on Plesk (installation instruction).
• If (1) does not help, check the IP address which your website builder domain is resolved to on your Plesk server. Try running the following command on Plesk server terminal:
  # curl http://[builder-domain]/api/status
  (replace "[builder-domain]" with a real domain of your website builder installation).
  If you do not get response {"ok":true}, it means that locally Plesk makes call to a different place, and not to website builder. In this case, check file "/etc/hosts" whether you have hardcoded IP for website builder domain specified. If yes, try to remove it (or temporarily comment) and check if website builder starts working.