Plugin UPM POLL fatal error on activation

  • When activating plugin I recieved the following msg :

    Fatal error: Cannot redeclare upgrade_all() (previously declared in /var/www/vhosts/entre-ami.ca/httpdocs/wordpress/wp-admin/includes/upgrade.php:389) in /var/www/vhosts/entre-ami.ca/httpdocs/wordpress/wp-admin/includes/upgrade.php on line 458

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