Certain actions like creating new subscription, email address, adding subdomain fail with the following error:
500 - Internal server error.
There is a problem with the resource you are looking for, and it cannot be displayed.
The following error can be observed in the
Fatal error 401: Mobile Connector initialization failed: Specified config file 'C:\\Plesk\\var\\modules\\plesk-mobile\\config.json' is not readable.
Parallels Panel Mobile Center extension got corrupted, the file mentioned in the error (C:\Plesk\var\modules\plesk-mobile\config.json') is missing.
Reinstall Parallels Panel Mobile Center extension:
Go to the Server Administration Panel > Extension and remove Plesk Panel Mobile Center 1.3
Download latest version of Plesk Panel Mobile Center
Go to the Server Administration Panel > Extension > Add new extension > Upload downloaded extension