Cannot install a license: The operation you were performing failed

Symptoms

1. Unable to install a license in Tools & Settings > License Management > Install Key:

   PLESK_ERROR: The operation you were performing failed. You can retry the operation with or without changing its parameters. You may also want to report this problem to our support so that we could help you as soon as possible.

2. The following can be found in "%plesk_dir%"\admin\logs\php_error.log :

   CONFIG_TEXT: ERR [panel] Exception: Access is denied.
   file: C:\Program Files (x86)\Parallels\Plesk\admin\plib\Lock\Manager\Hierarchical.php
   line: 114
   code: 0
   trace: #0 C:\Program Files (x86)\Parallels\Plesk\admin\plib\Lock\Manager\Hierarchical.php(114): LockManagerClient->__construct()
   #1 C:\Program Files (x86)\Parallels\Plesk\admin\plib\Lock\Manager\Hierarchical.php(193): Plesk\Lock\Manager_Hierarchical->_getClient()
   #2 C:\Program Files (x86)\Parallels\Plesk\admin\plib\Lock\Manager\Hierarchical.php(155): Plesk\Lock\Manager_Hierarchical->_applyLock(string '', object of type Plesk\Lock\Resource)
   #3 C:\Program Files (x86)\Parallels\Plesk\admin\plib\Lock\Manager.php(83): Plesk\Lock\Manager_Hierarchical->lock(object of type Plesk\Lock\Resource, string '')
   #4 C:\Program Files (x86)\Parallels\Plesk\admin\plib\Lock.php(34): Plesk\Lock\Manager->lock(integer '1', array, string '', array)
   #5 C:\Program Files (x86)\Parallels\Plesk\admin\htdocs\server\key_upload.php(28): Plesk\Lock::write(object of type Plesk\Lock\Object_Service, string '', array)

Cause

Incorrect permissions for Plesk directory.

Resolution

1. Connect to the server via RDP.

2. Open Start > Plesk Reconfigurator > Repair Plesk installation

3. Select the following options:

   CONFIG_TEXT: Plesk Server Accounts
   Plesk File Security
   Plesk Services
   Plesk Database

4. Click Check.