Ever since installing the latest update from May 10, my sites won’t let me go to the Sites menu at the Network (multisite) level. I get the message:

The site is experiencing technical difficulties. Please check your site admin email inbox for instructions.

No emails are ever sent.

In the httpd error logfile, I get the following:

[Mon May 13 15:47:52 2019] [<site.host.edu>] [pid 16107] sapi_apache2.c(326): [client <ipaddress>:59496] PHP Fatal error:  Uncaught TypeError: Argument 1 passed to ACP\\Export\\Addon::load_list_screen() must 
implement interface ACP\\Export\\ListScreen, instance of ACP\\ListScreen\\MSSite given, called in /home/wp/pages/wp-includes/class-wp-hook.php on line 286 and defined in /home/wp/pages/wp-content/plugins/admin-columns-pro/classes/Export/Addon.php:94\n
Stack trace:\n
#0 /home/wp/pages/wp-includes/class-wp-hook.php(286): ACP\\Export\\Addon->load_list_screen(Object(ACP\\ListScreen\\MSSite))\n#1 /home/wp/pages/wp-includes/class-wp-hook.php(310): WP_Hook->apply_filters(NULL, Array)\n
#2 /home/wp/pages/wp-includes/plugin.php(465): WP_Hook->do_action(Array)\n
#3 /home/wp/pages/wp-content/plugins/admin-columns-pro/admin-columns/classes/ScreenController.php(25): do_action('ac/table/list_s...', Object(ACP\\ListScreen\\MSSite))\n
#4 /home/wp/pages/wp-content/plugins/admin-columns-pro/admin-columns/classes/Table/Screen.php(40): AC\\ScreenController->__construct(Object(ACP\\ListScreen\\MSSite))\n
#5 /home/wp/pages/wp-content/plugins/admin-columns-pro/admin-columns/c in /home/wp/pages/wp-content/plugins/admin-columns-pro/classes/Export/Addon.php on line 94