I have done this but when I try and add a new page I am getting this error

Fatal error: Uncaught Error: Call to undefined function A8C\FSE\is_automattician() in /home/m0uiv5ymc60h/public_html/tca.pizzarepair.com/wp-content/plugins/full-site-editing/starter-page-templates/class-starter-page-templates.php:282 Stack trace: #0 /home/m0uiv5ymc60h/public_html/tca.pizzarepair.com/wp-content/plugins/full-site-editing/starter-page-templates/class-starter-page-templates.php(182): A8C\FSE\Starter_Page_Templates->get_page_templates(‘en’) #1 /home/m0uiv5ymc60h/public_html/tca.pizzarepair.com/wp-includes/class-wp-hook.php(324): A8C\FSE\Starter_Page_Templates->enqueue_assets(”) #2 /home/m0uiv5ymc60h/public_html/tca.pizzarepair.com/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(NULL, Array) #3 /home/m0uiv5ymc60h/public_html/tca.pizzarepair.com/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #4 /home/m0uiv5ymc60h/public_html/tca.pizzarepair.com/wp-admin/edit-form-blocks.php(272): do_action(‘enqueue_block_e…’) #5 /home/m0uiv5ymc60h/public_html/tca.pizzarepair.com/wp-admin/post-new.php(72): r in /home/m0uiv5ymc60h/public_html/tca.pizzarepair.com/wp-content/plugins/full-site-editing/starter-page-templates/class-starter-page-templates.php on line 282