Unable to access/activate Plesk Onyx: The license key is invalid. In order to use the Panel, you need to obtain and install a new valid license key

Symptoms

• Plesk cannot be accessed/activated

  One of the following errors on web browser screen:

  Error: The license key is invalid. In order to use the Panel, you need to obtain and install a new valid license key. The amount of currently used resources overrides the limits defined by your license.

  OR

  xmlrpc error: Expected <param> to have 1 children, found 0
  ---------------------- Debug Info -------------------------------
  0: common_func.php3:4675
  of_get_all_keys()
  1: common_func.php3:4675
  pkey_fetch_key_list()
  2: KeyInfoForm.php:171
  KeyInfoForm->get_bye_online_url(string 'new', string '')
  3: KeyInfoForm.php:77
  KeyInfoForm->assign()
  4: key_info.php:43
  require(string 'C:Program FilesParallelsPleskadminhtdocsserverkey_info.php')
  5: plesk.php:66

  OR

  ERROR: SWKeyExFatalError

  OR

  xmlrpc error: XML parsing failed
  0: common_func.php3:4523
  of_get_key_by_product(string 'plesk-win')
  1: common_func.php3:4523
  getPleskKey()
  2: common_func.php3:4602
  getKeyProp(string 'demo')
  3: auth.php3:54

  OR

  external error:
  Repository is not opened
  Message Repository is not opened
  File functions.php
  Line 3330
  Type SWKeyExFatalError

  OR

  Unable to get key: Repository is not opened.

  OR

  PLESK_ERROR: Error: The license key is invalid. In order to use Plesk, you need to obtain and install a new valid license key. 
  The amount of currently used resources overrides the limits defined by your license. 
  The number of websites hosted on the server exceeds the limits defined by your license. You have 5 sites hosted; your license allows hosting only 0 sites. 
  The number of served customer accounts exceeds the limits defined by your license. You have 8 customer accounts currently served; your license allows serving only 0 customer accounts. 
  The number of served email accounts exceeds the limits defined by your license. You have 49 email accounts currently served; your license allows serving only 0 email accounts

  OR

  The amount of resources you operate with has exceeded the limits defined by your current product license. Please contact Plesk sales department and purchase a new license key.

• Cannot retrieve Plesk license via a command-line interface:

  # plesk bin license --retrieve
  Could not open Repository at "/etc/sw/keys": Empty repository file: /etc/sw/keys/registry.xml
  ERR [panel] Unable to get key: Repository is not opened
  ERR [panel] Unable to get key: Repository is not opened
  Repository is not opened
  exit status 3

Cause

Resolution

For Plesk Onyx 17.8, install the latest Plesk micro-updates.

For Plesk Onyx 17.5 and 17.0, upgrade to the latest Plesk version.

As a workaround: