Lots of fatal errors on the site can access add a new page

Hi guys

Here is the email I get,

WordPress version 5.3.2
Current theme: Enfold (version 3.6.1)
Current plugin: (version )
PHP version 7.1.24

Error Details
=============
An error of type E_ERROR was caused in line 489 of the file /home3/pandora/public_html/summitbusinessiq.com/wp-content/themes/enfold/config-templatebuilder/avia-template-builder/php/shortcode-template.class.php. Error message: Uncaught Error: Cannot use string offset as an array in /home3/pandora/public_html/summitbusinessiq.com/wp-content/themes/enfold/config-templatebuilder/avia-template-builder/php/shortcode-template.class.php:489
Stack trace:
#0 /home3/pandora/public_html/summitbusinessiq.com/wp-content/themes/enfold/config-templatebuilder/avia-template-builder/php/shortcode-template.class.php(443): aviaShortcodeTemplate->create_sortable_editor_element(Array)
#1 /home3/pandora/public_html/summitbusinessiq.com/wp-content/themes/enfold/config-templatebuilder/avia-template-builder/php/template-builder.class.php(397): aviaShortcodeTemplate->prepare_editor_element()
#2 /home3/pandora/public_html/summitbusinessiq.com/wp-includes/class-wp-hook.php(288): AviaBuilder->js_template_editor_elements(”)
#3 /home3/pandora/public_html/summitbusinessiq.com/wp-includes/class-wp-hook.php(312): WP_Hook->apply_filters(”, Array)
#4 /home3/pandora/public_html/summitbusinessiq.com/wp-includes/plugin.php(478): WP_Hook->do_action(Array)
#5 /home3/pand

Also, I can’t create a new page or edit one.
Please help
Thank you

PAOLO