- Plesk 12.0 for Windows
Mobile Site button is not available in Home > Subscriptions > example.com > Websites & Domains > example.com .
Upon clicking on a Unity One per domain license key in Tools and Settings > License Management > Additional License Keys the following error is displayed:
ERROR: Unsupported operand types (Additional.php:152)
This is Plesk internal issue with ID #PPPM-3344 , which was fixed in 12.0.18 MU#67 .
Apply the latest Plesk microupdates to fix the issue.