Error in Plesk: errors in configuration templates: Wrong variable to subsitute: os file

Symptoms

• Plesk shows the following error:

  PLESK_ERROR: New configuration files for the Apache web server were not created due to the errors in configuration templates: Template processing failed: file = /usr/local/psa/admin/conf/templates/default/webmail/webmail.php, error = Template_Exception: [Template_Variable_Server_WebServer] Wrong variable to subsitute: os file: /usr/local/psa/admin/plib/Template/Processor.php

•  Atmail webmail is used for domains from MySQL query below:

  # plesk db "select name from domains where id in (SELECT objectId FROM Configurations WHERE status='error' and description like '%Wrong variable to subsitute: os file%') ;"

Cause

Atmail Open is supported by Plesk until  Plesk 11.5. 

Resolution

• Log into Plesk.
• Find affected domains using the following MySQL query:

  # plesk db "select name from domains where id in (SELECT objectId FROM Configurations WHERE status='error' and description like '%Wrong variable to subsitute: os file%') ;"

• Switch to another webmail for domains from the previous step under Domains > example.com > Mail Settings > Webmail.

  Note: install additional webmail if required How to install and manage webmail in Plesk?