Update 1.3.0 delivers error codes

Since the 1.3.0 update the site shows error messages.

The front end of site shows:

Warning: count(): Parameter must be an array or an object that implements Countable in /homepages/2/d569616784/htdocs/clickandbuilds/NatCorn/wp-content/plugins/shortcodes-finder/includes/class-shortcodes-finder.php on line 176

Warning: session_start(): Cannot start session when headers already sent in /homepages/2/d569616784/htdocs/clickandbuilds/NatCorn/wp-content/plugins/wpforo/wpf-includes/class-notices.php on line 16

Warning: Invalid argument supplied for foreach() in /homepages/2/d569616784/htdocs/clickandbuilds/NatCorn/wp-content/plugins/shortcodes-finder/public/class-shortcodes-finder-public.php on line 127

The admin sign in will not load and displays the following:

Warning: count(): Parameter must be an array or an object that implements Countable in /homepages/2/d569616784/htdocs/clickandbuilds/NatCorn/wp-content/plugins/shortcodes-finder/includes/class-shortcodes-finder.php on line 176

Warning: Cannot modify header information – headers already sent by (output started at /homepages/2/d569616784/htdocs/clickandbuilds/NatCorn/wp-content/plugins/shortcodes-finder/includes/class-shortcodes-finder.php:176) in /homepages/2/d569616784/htdocs/clickandbuilds/NatCorn/wp-includes/functions.php on line 6029

Warning: Cannot modify header information – headers already sent by (output started at /homepages/2/d569616784/htdocs/clickandbuilds/NatCorn/wp-content/plugins/shortcodes-finder/includes/class-shortcodes-finder.php:176) in /homepages/2/d569616784/htdocs/clickandbuilds/NatCorn/wp-admin/includes/misc.php on line 1252

Warning: Cannot modify header information – headers already sent by (output started at /homepages/2/d569616784/htdocs/clickandbuilds/NatCorn/wp-content/plugins/shortcodes-finder/includes/class-shortcodes-finder.php:176) in /homepages/2/d569616784/htdocs/clickandbuilds/NatCorn/wp-admin/admin-header.php on line 9

I have removed the plugin temporarily in order to restore the site.

I’d be grateful for any help

The page I need help with: [log in to see the link]