Sydney toolbox Fatal error

  • I get this fatal error when trying to activate Sydney toolbox

    Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, class "sydney-toolbox" not found in /var/www/vhosts/delicatus.fi/httpdocs/wp-includes/class-wp-hook.php:303 Stack trace: #0 /var/www/vhosts/delicatus.fi/httpdocs/wp-includes/class-wp-hook.php(327): WP_Hook->apply_filters() #1 /var/www/vhosts/delicatus.fi/httpdocs/wp-includes/plugin.php(470): WP_Hook->do_action() #2 /var/www/vhosts/delicatus.fi/httpdocs/wp-admin/plugins.php(193): do_action() #3 {main} thrown in /var/www/vhosts/delicatus.fi/httpdocs/wp-includes/class-wp-hook.php on line 303

    I have WordPress version 5.8.2.; Sydney Child theme version Version: 1.35.1488800743, and Sydney toolbox version 1.20

    My website is not functioning at the moment as I cannot activate Sydney toolbox.

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