Unable to create or edit user roles: ERROR 500 Zend_Form_Exception: Element name must be a string

Symptoms

• Unable to create or edit an existing user role from Subscriptions > example.com > Users > User Roles or logged as the customer under Users > User Roles with the error:

  500 Zend_Form_Exception
  Message: Element name must be a string
  File: Form.php
  Line: 1100

• One or more applications was installed on the domain from the APS catalog at Domains > example.com > Install Application > More Apps.

Cause

Product issue:

• PPPM-14031 "Cannot view or edit subscription roles if APS application is installed on a domain"

  Fixed in:

  • Plesk Obsidian, 20 June 2023

Resolution

Please consider updating your server:

• How to upgrade Plesk