Unable to login to Plesk, the following error appears:
Action Helper by name Form not found
/var/log/plesk/panel.log file also contains the following error
[2017-01-17 10:32:59] ERR [panel] Action Helper by name Form not found: 0: /opt/psa/admin/plib/Zend/Controller/Action/HelperBroker.php:369
2: /opt/psa/admin/plib/Application/Web.php:90 Plesk\Application_Web->_initFrontController()
"Foreign" non-Plesk instance of Zend framework located in Plesk sw-engine `include_path`.
- Ensure that there is no
- Delete it or move out from