Fatal error: Uncaught Error: Class ‘WP_Theme_JSON_Resolver’ not found

I can not access my dashboard or website. Below is the warning and fatal error message I am receiving. I have tried to several troubleshooting options including deactivating the plugins, deleting files and reinstalling the download, but nothing is working so far. Any help is appreciated.

Warning: call_user_func_array() expects parameter 1 to be a valid callback, function ‘wp_enable_block_templates’ not found or invalid function name in aloftaloft.com\wp-includes\class-wp-hook.php on line 303

Fatal error: Uncaught Error: Class ‘WP_Theme_JSON_Resolver’ not found in aloftaloft.com\wp-includes\script-loader.php:1530 Stack trace: #0 aloftaloft.com\wp-includes\class-wp-hook.php(303): wp_default_styles(Object(WP_Styles)) #1 aloftaloft.com\wp-includes\class-wp-hook.php(327): WP_Hook->apply_filters(”, Array) #2 aloftaloft.com\wp-includes\plugin.php(518): WP_Hook->do_action(Array) #3 aloftaloft.com\wp-includes\class.wp-styles.php(135): do_action_ref_array(‘wp_default_styl…’, Array) #4 aloftaloft.com\wp-includes\functions.wp-styles.php(24): WP_Styles->__construct() #5 aloftaloft.com\wp-includes\functions.wp-styles.php(176): wp_styles() #6 aloftaloft.com\wp-login.php(96): wp_enqueue_style(‘login’) #7 aloftaloft.com\wp-login.php(1285): login_header(‘Log In’, ”, Object(WP_Error)) #8 {main} thrown in aloftaloft.com\wp-includes\script-loader.php on line 1530`

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