Plesk shows the error: Trait ‘PleskExt<ext_name>pathtofile.php’ not found (CustomButtons.php:11) – Plesk

Symptoms

• Plesk interface shows one of the following error messages:

  ERROR: Trait 'PleskExtCatalogHelperPermissionsTrait' not found (CustomButtons.php:8)

  ---

  ERROR: Trait 'PleskExtAdvisorHelperProductInfo' not found (CustomButtons.php:12)

  ---

  ERROR: Trait 'PleskExtSslItCertificateIssuanceCertSubjectGeneratorAwareTrait' not found (Permissions.php:11)

  ---

  ERROR: Trait 'PleskExtSslItPleskExtensionsPleskExtensions' not found (Permissions.php:11)

• The Extensions menu is not opening with one of these error messages:

  Cannot send headers; headers already sent in /opt/psa/admin/plib/modules/sslit/library/Config.php, line 1

  ---

  Cannot send headers; headers already sent in /usr/local/psa/admin/plib/modules/sslit/library/Config.php, line 1

• In Plesk Obsidian, when clicking Repair All or Check All at Tools & Settings > Diagnose & Repair, the following error appears:

  this.getDate(...).map is not a function

Cause

Installation of the extension (highlighted in the error) is corrupted.

Resolution

Reinstall the extension:

1. Connect to the Plesk server via SSH (Linux) / RDP (Windows Server).

2. Run the command below to reinstall the extension (on Windows Server, use a command prompt as an Administrator):

   # plesk bin extension --install <extension_name>

   where <extension name> is the name of the extension mentioned after PleskExt in the error message. Use lowercase letters only in the command.

   Example:

   If the error is:

   Trait 'PleskExtCatalogHelperPermissionsTrait' not found (CustomButtons.php:8)

   then use the command:

   # plesk bin extension --install catalog

   Note: If the error still appears on the Home page in Plesk, apply the resolution steps from this KB article.