Fatal error

I have installed the “Gutenberg Post Blocks” plugin, pro version. It all worked fine until late yesterday. I dont know what happend, but suddenly a fatal error appeared. Can you help?

The error says: Fatal error: Uncaught Error: Object of class WP_Error could not be converted to string in /var/www/telman.dk/test/wp-content/themes/enfold/config-templatebuilder/avia-template-builder/php/element-templates.class.php:731 Stack trace: #0 /var/www/telman.dk/test/wp-includes/class-wp-hook.php(292): aviaElementTemplates->handler_pages_custom_column(0, 20901) #1 /var/www/telman.dk/test/wp-includes/class-wp-hook.php(316): WP_Hook->apply_filters(NULL, Array) #2 /var/www/telman.dk/test/wp-includes/plugin.php(484): WP_Hook->do_action(Array) #3 /var/www/telman.dk/test/wp-admin/includes/class-wp-posts-list-table.php(1269): do_action(‘manage_posts_cu…’, 0, 20901) #4 /var/www/telman.dk/test/wp-admin/includes/class-wp-list-table.php(1447): WP_Posts_List_Table->column_default(Object(WP_Post), 0) #5 /var/www/telman.dk/test/wp-admin/includes/class-wp-posts-list-table.php(1315): WP_List_Table->single_row_columns(Object(WP_Post)) #6 /var/www/telman.dk/test/wp-admin/includes/class-wp-posts-list-table.php(750): WP_Posts_List_Table->single_ro in /var/www/telman.dk/test/wp-content/themes/enfold/config-templatebuilder/avia-template-builder/php/element-templates.class.php on line 731
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