Gutenber problem

Helklo, i try to personalize/customize the enfold theme, and i have this error:
Fatal error: Uncaught Error: Call to undefined function gutenberg_can_edit_post_type() in /home/customer/www/festivalesaereos.es/public_html/wp-content/themes/enfold/config-gutenberg/class-avia-gutenberg.php:517 Stack trace: #0 /home/customer/www/festivalesaereos.es/public_html/wp-content/themes/enfold/config-gutenberg/class-avia-gutenberg.php(377): Avia_Gutenberg->can_use_block_editor(‘post’, true) #1 /home/customer/www/festivalesaereos.es/public_html/wp-content/themes/enfold/config-gutenberg/class-avia-gutenberg.php(412): Avia_Gutenberg->init_force_classic_post_types() #2 /home/customer/www/festivalesaereos.es/public_html/wp-content/themes/enfold/config-gutenberg/class-avia-gutenberg.php(487): Avia_Gutenberg->get_force_classic_post_types() #3 /home/customer/www/festivalesaereos.es/public_html/wp-content/themes/enfold/config-gutenberg/class-avia-gutenberg.php(615): Avia_Gutenberg->force_classic_editor(‘page’) #4 /home/customer/www/festivalesaereos.es/public_html/wp-includes/class-wp-hook.php(307): Avia_Gutenberg->handler in /home/customer/www/festivalesaereos.es/public_html/wp-content/themes/enfold/config-gutenberg/class-avia-gutenberg.php on line 517

how can i resolve this? thanks!