Error appears in Plesk: Syntax error on line 38 of example.com_webmail.conf: DocumentRoot takes one argument, Root directory of the document tree

Symptoms

• Disabling a domain in Plesk fails with:

  PLESK_ERROR: AH00526: Syntax error on line 38 of /etc/apache2/plesk.conf.d/webmails/example.com_webmail.conf: DocumentRoot takes one argument, Root directory of the document tree . Detailed error descriptions were sent to you by email.

• Webmail for a domain is set to None in Domains > example.com > Mail Settings, but apache’s configuration contains data as if Roundcube or Horde webmail is enabled for a domain:

  # cat /etc/httpd/conf/plesk.conf.d/webmail/example.com_webmail.conf
  DocumentRoot “”
  Alias /horde/ “/”

• Horde webmail was installed previously and then removed.

Cause

Product issue:

• #PPPM-12984 “Disabling a domain whose webmail service was uninstalled no longer generates an incorrect webmail configuration.”
  Fixed in:
  • Plesk Obsidian 08 June 2021 (Linux)

Resolution

Please consider updating your server:

• How to install Plesk updates

Workaround

If update is not possible for some reason, you may try the following