[wp-trac] [WordPress Trac] #54544: fatal error when entering the site editor after updating to 5.9-beta1

[WordPress Trac]

#54544: fatal error when entering the site editor after updating to 5.9-beta1
--------------------------+-----------------------------
 Reporter:  pbiron        |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Editor        |    Version:  trunk
 Severity:  normal        |   Keywords:
  Focuses:                |
--------------------------+-----------------------------
 After updating to 5.9-beta1 via the [xx Beta Tester plugin], when I switch
 to the 2022 them and try to enter the site editor, I get the following
 fatal error:

 {{{
 Fatal error: Uncaught Error: Class 'WP_REST_Edit_Site_Export_Controller'
 not found
 in /path-to-site/wp-includes/rest-api.php on line 354
 }}}

 I do not have CLI access to the site that is experiencing that problem, so
 it's hard for me to debug the problem any further.

 I also updated a few other sites on my local machine and I'm getting that
 error on the other sites.

 Here's the full error log:

 {{{
 [30-Nov-2021 23:46:30 UTC] PHP Fatal error:  Uncaught Error: Class
 'WP_REST_Edit_Site_Export_Controller' not found in /path-to-site/wp-
 includes/rest-api.php:354
 Stack trace:
 #0 /path-to-site/wp-includes/class-wp-hook.php(303):
 create_initial_rest_routes(Object(WP_REST_Server))
 #1 /path-to-site/wp-includes/class-wp-hook.php(327):
 WP_Hook->apply_filters(NULL, Array)
 #2 /path-to-site/wp-includes/plugin.php(470): WP_Hook->do_action(Array)
 #3 /path-to-site/wp-includes/rest-api.php(553): do_action('rest_api_init',
 Object(WP_REST_Server))
 #4 /path-to-site/wp-includes/rest-api.php(511): rest_get_server()
 #5 /path-to-site/wp-includes/rest-api.php(2860):
 rest_do_request(Object(WP_REST_Request))
 #6 [internal function]: rest_preload_api_request(Array, '/wp/v2/media')
 #7 /path-to-site/wp-includes/block-editor.php(474): array_reduce(Array,
 'rest_preload_ap...', Array)
 #8 /home/sangr1/public_html/dev2/wp-admin/site-editor.php(108): block_edit
 in /path-to-site/wp-includes/rest-api.php on line 354
 }}}

-- 
Ticket URL: <https://core.trac.wordpress.org/ticket/54544>
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