Unable to download Action Log file

Symptoms

• Unable to download the Action Log file (Home > Tools & Settings > Action Log > Download);

• The following entries can be found in /usr/local/psa/admin/logs/panel.log file:

  CONFIG_TEXT: ERR [1] Exception: PHP Warning: Cannot modify header information - headers already sent by (output started at /usr/local/psa/admin/plib/modules/pn-pdns/hooks/ActionLog.php:12); File:
  /usr/local/psa/admin/plib/functions.php, Line: 2016
  

• There PowerDNS ("pn-pdns") extension is installed. The extension is not listed in Plesk Extension catalog.

Note: Extension files are located in the following directory: /usr/local/psa/admin/plib/modules

Cause

The file /usr/local/psa/admin/plib/modules/pn-pdns/hooks/ActionLog.php is breaking Plesk functionality while attempting to download the Action Log.

Resolution

Either remove PowerDNS (pn-pnds) extension or contact its developer to manage the issue.