Plugin not working

Hi,
What do you mean there’s no carrier?
I’ve checked and it’s working normally with WP5.5 and WC4.3.3. Do you see any error in your browser console?

Eroor message noting but
https://ibb.co/vz2mnvg as this picture

Eroor message noting but
https://ibb.co/vz2mnvg as this picture

and other tabs do not work either

I think there is javascript conflict with other plugins.
Please send me a screenshot of your browser console, like this https://prnt.sc/tzzsae

https://ibb.co/f1mjqRp this

Yes there are some errors. Please look at your debug log to see if there’s any error when you view the orders tracking settings page.

[15-Aug-2020 10:19:52 UTC] PHP Fatal error: Uncaught Error: Call to a member function is_mailer_complete() on null in C:\wamp64\www\En\wp-content\plugins\wp-mail-smtp\src\SiteHealth.php:133
Stack trace:
#0 C:\wamp64\www\En\wp-admin\includes\class-wp-site-health.php(175): WPMailSMTP\SiteHealth->mailer_setup_complete_test()
#1 C:\wamp64\www\En\wp-admin\includes\class-wp-site-health.php(128): WP_Site_Health->perform_test(Array)
#2 C:\wamp64\www\En\wp-includes\class-wp-hook.php(287): WP_Site_Health->enqueue_scripts(‘site-health.php’)
#3 C:\wamp64\www\En\wp-includes\class-wp-hook.php(311): WP_Hook->apply_filters(NULL, Array)
#4 C:\wamp64\www\En\wp-includes\plugin.php(478): WP_Hook->do_action(Array)
#5 C:\wamp64\www\En\wp-admin\admin-header.php(102): do_action(‘admin_enqueue_s…’, ‘site-health.php’)
#6 C:\wamp64\www\En\wp-admin\site-health.php(35): require_once(‘C:\\wamp64\\www\\E…’)
#7 {main}
thrown in C:\wamp64\www\En\wp-content\plugins\wp-mail-smtp\src\SiteHealth.php on line 133
[15-Aug-2020 10:21:04 UTC] PHP Notice: Undefined index: slug in C:\wamp64\www\En\wp-content\plugins\woo-orders-tracking\includes\data.php on line 166
[15-Aug-2020 10:21:04 UTC] PHP Stack trace:
[15-Aug-2020 10:21:04 UTC] PHP 1. {main}() C:\wamp64\www\En\wp-admin\edit.php:0
[15-Aug-2020 10:21:04 UTC] PHP 2. WP_Posts_List_Table->display() C:\wamp64\www\En\wp-admin\edit.php:449
[15-Aug-2020 10:21:04 UTC] PHP 3. WP_Posts_List_Table->display_rows_or_placeholder() C:\wamp64\www\En\wp-admin\includes\class-wp-list-table.php:1249
[15-Aug-2020 10:21:04 UTC] PHP 4. WP_Posts_List_Table->display_rows() C:\wamp64\www\En\wp-admin\includes\class-wp-list-table.php:1322
[15-Aug-2020 10:21:04 UTC] PHP 5. WP_Posts_List_Table->_display_rows() C:\wamp64\www\En\wp-admin\includes\class-wp-posts-list-table.php:728
[15-Aug-2020 10:21:04 UTC] PHP 6. WP_Posts_List_Table->single_row() C:\wamp64\www\En\wp-admin\includes\class-wp-posts-list-table.php:751
[15-Aug-2020 10:21:04 UTC] PHP 7. WP_Posts_List_Table->single_row_columns() C:\wamp64\www\En\wp-admin\includes\class-wp-posts-list-table.php:1304
[15-Aug-2020 10:21:04 UTC] PHP 8. WP_Posts_List_Table->column_default() C:\wamp64\www\En\wp-admin\includes\class-wp-list-table.php:1410
[15-Aug-2020 10:21:04 UTC] PHP 9. do_action() C:\wamp64\www\En\wp-admin\includes\class-wp-posts-list-table.php:1271
[15-Aug-2020 10:21:04 UTC] PHP 10. WP_Hook->do_action() C:\wamp64\www\En\wp-includes\plugin.php:478
[15-Aug-2020 10:21:04 UTC] PHP 11. WP_Hook->apply_filters() C:\wamp64\www\En\wp-includes\class-wp-hook.php:311
[15-Aug-2020 10:21:04 UTC] PHP 12. VI_WOO_ORDERS_TRACKING_ADMIN_ORDERS_TRACK_INFO->manage_shop_order_posts_custom_column() C:\wamp64\www\En\wp-includes\class-wp-hook.php:287
[15-Aug-2020 10:21:04 UTC] PHP 13. VI_WOO_ORDERS_TRACKING_ADMIN_ORDERS_TRACK_INFO->get_shipping_carrier_by_slug() C:\wamp64\www\En\wp-content\plugins\woo-orders-tracking\includes\admin\orders-track-info.php:164
[15-Aug-2020 10:21:04 UTC] PHP 14. VI_WOO_ORDERS_TRACKING_DATA->get_shipping_carrier_by_slug() C:\wamp64\www\En\wp-content\plugins\woo-orders-tracking\includes\admin\orders-track-info.php:114
[15-Aug-2020 10:21:04 UTC] PHP Notice: Undefined index: slug in C:\wamp64\www\En\wp-content\plugins\woo-orders-tracking\includes\data.php on line 166
[15-Aug-2020 10:21:04 UTC] PHP Stack trace:
[15-Aug-2020 10:21:04 UTC] PHP 1. {main}() C:\wamp64\www\En\wp-admin\edit.php:0
[15-Aug-2020 10:21:04 UTC] PHP 2. WP_Posts_List_Table->display() C:\wamp64\www\En\wp-admin\edit.php:449
[15-Aug-2020 10:21:04 UTC] PHP 3. WP_Posts_List_Table->display_rows_or_placeholder() C:\wamp64\www\En\wp-admin\includes\class-wp-list-table.php:1249
[15-Aug-2020 10:21:04 UTC] PHP 4. WP_Posts_List_Table->display_rows() C:\wamp64\www\En\wp-admin\includes\class-wp-list-table.php:1322
[15-Aug-2020 10:21:04 UTC] PHP 5. WP_Posts_List_Table->_display_rows() C:\wamp64\www\En\wp-admin\includes\class-wp-posts-list-table.php:728
[15-Aug-2020 10:21:04 UTC] PHP 6. WP_Posts_List_Table->single_row() C:\wamp64\www\En\wp-admin\includes\class-wp-posts-list-table.php:751
[15-Aug-2020 10:21:04 UTC] PHP 7. WP_Posts_List_Table->single_row_columns() C:\wamp64\www\En\wp-admin\includes\class-wp-posts-list-table.php:1304
[15-Aug-2020 10:21:04 UTC] PHP 8. WP_Posts_List_Table->column_default() C:\wamp64\www\En\wp-admin\includes\class-wp-list-table.php:1410
[15-Aug-2020 10:21:04 UTC] PHP 9. do_action() C:\wamp64\www\En\wp-admin\includes\class-wp-posts-list-table.php:1271
[15-Aug-2020 10:21:04 UTC] PHP 10. WP_Hook->do_action() C:\wamp64\www\En\wp-includes\plugin.php:478
[15-Aug-2020 10:21:04 UTC] PHP 11. WP_Hook->apply_filters() C:\wamp64\www\En\wp-includes\class-wp-hook.php:311
[15-Aug-2020 10:21:04 UTC] PHP 12. VI_WOO_ORDERS_TRACKING_ADMIN_ORDERS_TRACK_INFO->manage_shop_order_posts_custom_column() C:\wamp64\www\En\wp-includes\class-wp-hook.php:287
[15-Aug-2020 10:21:04 UTC] PHP 13. VI_WOO_ORDERS_TRACKING_ADMIN_ORDERS_TRACK_INFO->get_shipping_carrier_by_slug() C:\wamp64\www\En\wp-content\plugins\woo-orders-tracking\includes\admin\orders-track-info.php:164
[15-Aug-2020 10:21:04 UTC] PHP 14. VI_WOO_ORDERS_TRACKING_DATA->get_shipping_carrier_by_slug() C:\wamp64\www\En\wp-content\plugins\woo-orders-tracking\includes\admin\orders-track-info.php:114
[15-Aug-2020 10:21:10 UTC] PHP Notice: Undefined index: slug in C:\wamp64\www\En\wp-content\plugins\woo-orders-tracking\includes\data.php on line 166
[15-Aug-2020 10:21:10 UTC] PHP Stack trace:
[15-Aug-2020 10:21:10 UTC] PHP 1. {main}() C:\wamp64\www\En\wp-admin\edit.php:0
[15-Aug-2020 10:21:10 UTC] PHP 2. WP_Posts_List_Table->display() C:\wamp64\www\En\wp-admin\edit.php:449
[15-Aug-2020 10:21:10 UTC] PHP 3. WP_Posts_List_Table->display_rows_or_placeholder() C:\wamp64\www\En\wp-admin\includes\class-wp-list-table.php:1249
[15-Aug-2020 10:21:10 UTC] PHP 4. WP_Posts_List_Table->display_rows() C:\wamp64\www\En\wp-admin\includes\class-wp-list-table.php:1322
[15-Aug-2020 10:21:10 UTC] PHP 5. WP_Posts_List_Table->_display_rows() C:\wamp64\www\En\wp-admin\includes\class-wp-posts-list-table.php:728
[15-Aug-2020 10:21:10 UTC] PHP 6. WP_Posts_List_Table->single_row() C:\wamp64\www\En\wp-admin\includes\class-wp-posts-list-table.php:751
[15-Aug-2020 10:21:10 UTC] PHP 7. WP_Posts_List_Table->single_row_columns() C:\wamp64\www\En\wp-admin\includes\class-wp-posts-list-table.php:1304
[15-Aug-2020 10:21:10 UTC] PHP 8. WP_Posts_List_Table->column_default() C:\wamp64\www\En\wp-admin\includes\class-wp-list-table.php:1410
[15-Aug-2020 10:21:10 UTC] PHP 9. do_action() C:\wamp64\www\En\wp-admin\includes\class-wp-posts-list-table.php:1271
[15-Aug-2020 10:21:10 UTC] PHP 10. WP_Hook->do_action() C:\wamp64\www\En\wp-includes\plugin.php:478
[15-Aug-2020 10:21:10 UTC] PHP 11. WP_Hook->apply_filters() C:\wamp64\www\En\wp-includes\class-wp-hook.php:311
[15-Aug-2020 10:21:10 UTC] PHP 12. VI_WOO_ORDERS_TRACKING_ADMIN_ORDERS_TRACK_INFO->manage_shop_order_posts_custom_column() C:\wamp64\www\En\wp-includes\class-wp-hook.php:287
[15-Aug-2020 10:21:10 UTC] PHP 13. VI_WOO_ORDERS_TRACKING_ADMIN_ORDERS_TRACK_INFO->get_shipping_carrier_by_slug() C:\wamp64\www\En\wp-content\plugins\woo-orders-tracking\includes\admin\orders-track-info.php:164
[15-Aug-2020 10:21:10 UTC] PHP 14. VI_WOO_ORDERS_TRACKING_DATA->get_shipping_carrier_by_slug() C:\wamp64\www\En\wp-content\plugins\woo-orders-tracking\includes\admin\orders-track-info.php:114
[15-Aug-2020 10:21:10 UTC] PHP Notice: Undefined index: slug in C:\wamp64\www\En\wp-content\plugins\woo-orders-tracking\includes\data.php on line 166
[15-Aug-2020 10:21:10 UTC] PHP Stack trace:
[15-Aug-2020 10:21:10 UTC] PHP 1. {main}() C:\wamp64\www\En\wp-admin\edit.php:0
[15-Aug-2020 10:21:10 UTC] PHP 2. WP_Posts_List_Table->display() C:\wamp64\www\En\wp-admin\edit.php:449
[15-Aug-2020 10:21:10 UTC] PHP 3. WP_Posts_List_Table->display_rows_or_placeholder() C:\wamp64\www\En\wp-admin\includes\class-wp-list-table.php:1249
[15-Aug-2020 10:21:10 UTC] PHP 4. WP_Posts_List_Table->display_rows() C:\wamp64\www\En\wp-admin\includes\class-wp-list-table.php:1322
[15-Aug-2020 10:21:10 UTC] PHP 5. WP_Posts_List_Table->_display_rows() C:\wamp64\www\En\wp-admin\includes\class-wp-posts-list-table.php:728
[15-Aug-2020 10:21:10 UTC] PHP 6. WP_Posts_List_Table->single_row() C:\wamp64\www\En\wp-admin\includes\class-wp-posts-list-table.php:751
[15-Aug-2020 10:21:10 UTC] PHP 7. WP_Posts_List_Table->single_row_columns() C:\wamp64\www\En\wp-admin\includes\class-wp-posts-list-table.php:1304
[15-Aug-2020 10:21:10 UTC] PHP 8. WP_Posts_List_Table->column_default() C:\wamp64\www\En\wp-admin\includes\class-wp-list-table.php:1410
[15-Aug-2020 10:21:10 UTC] PHP 9. do_action() C:\wamp64\www\En\wp-admin\includes\class-wp-posts-list-table.php:1271
[15-Aug-2020 10:21:10 UTC] PHP 10. WP_Hook->do_action() C:\wamp64\www\En\wp-includes\plugin.php:478
[15-Aug-2020 10:21:10 UTC] PHP 11. WP_Hook->apply_filters() C:\wamp64\www\En\wp-includes\class-wp-hook.php:311
[15-Aug-2020 10:21:10 UTC] PHP 12. VI_WOO_ORDERS_TRACKING_ADMIN_ORDERS_TRACK_INFO->manage_shop_order_posts_custom_column() C:\wamp64\www\En\wp-includes\class-wp-hook.php:287
[15-Aug-2020 10:21:10 UTC] PHP 13. VI_WOO_ORDERS_TRACKING_ADMIN_ORDERS_TRACK_INFO->get_shipping_carrier_by_slug() C:\wamp64\www\En\wp-content\plugins\woo-orders-tracking\includes\admin\orders-track-info.php:164
[15-Aug-2020 10:21:10 UTC] PHP 14. VI_WOO_ORDERS_TRACKING_DATA->get_shipping_carrier_by_slug() C:\wamp64\www\En\wp-content\plugins\woo-orders-tracking\includes\admin\orders-track-info.php:114
[15-Aug-2020 10:21:14 UTC] PHP Notice: Undefined index: slug in C:\wamp64\www\En\wp-content\plugins\woo-orders-tracking\includes\data.php on line 166
[15-Aug-2020 10:21:14 UTC] PHP Stack trace:
[15-Aug-2020 10:21:14 UTC] PHP 1. {main}() C:\wamp64\www\En\wp-admin\post.php:0
[15-Aug-2020 10:21:14 UTC] PHP 2. require() C:\wamp64\www\En\wp-admin\post.php:206
[15-Aug-2020 10:21:14 UTC] PHP 3. require_once() C:\wamp64\www\En\wp-admin\edit-form-advanced.php:423
[15-Aug-2020 10:21:14 UTC] PHP 4. do_action() C:\wamp64\www\En\wp-admin\admin-header.php:102
[15-Aug-2020 10:21:14 UTC] PHP 5. WP_Hook->do_action() C:\wamp64\www\En\wp-includes\plugin.php:478
[15-Aug-2020 10:21:14 UTC] PHP 6. WP_Hook->apply_filters() C:\wamp64\www\En\wp-includes\class-wp-hook.php:311
[15-Aug-2020 10:21:14 UTC] PHP 7. VI_WOO_ORDERS_TRACKING_ADMIN_ORDERS_EDIT_TRACKING->admin_enqueue_script() C:\wamp64\www\En\wp-includes\class-wp-hook.php:287
[15-Aug-2020 10:21:14 UTC] PHP 8. VI_WOO_ORDERS_TRACKING_DATA->get_shipping_carrier_url() C:\wamp64\www\En\wp-content\plugins\woo-orders-tracking\includes\admin\orders-edit-tracking.php:983
[15-Aug-2020 10:21:14 UTC] PHP 9. VI_WOO_ORDERS_TRACKING_DATA->get_shipping_carrier_by_slug() C:\wamp64\www\En\wp-content\plugins\woo-orders-tracking\includes\data.php:208
[15-Aug-2020 10:21:17 UTC] PHP Notice: Undefined index: slug in C:\wamp64\www\En\wp-content\plugins\woo-orders-tracking\includes\data.php on line 166
[15-Aug-2020 10:21:17 UTC] PHP Stack trace:
[15-Aug-2020 10:21:17 UTC] PHP 1. {main}() C:\wamp64\www\En\wp-admin\post.php:0
[15-Aug-2020 10:21:17 UTC] PHP 2. require() C:\wamp64\www\En\wp-admin\post.php:206
[15-Aug-2020 10:21:17 UTC] PHP 3. require_once() C:\wamp64\www\En\wp-admin\edit-form-advanced.php:423
[15-Aug-2020 10:21:17 UTC] PHP 4. do_action() C:\wamp64\www\En\wp-admin\admin-header.php:102
[15-Aug-2020 10:21:17 UTC] PHP 5. WP_Hook->do_action() C:\wamp64\www\En\wp-includes\plugin.php:478
[15-Aug-2020 10:21:17 UTC] PHP 6. WP_Hook->apply_filters() C:\wamp64\www\En\wp-includes\class-wp-hook.php:311
[15-Aug-2020 10:21:18 UTC] PHP 7. VI_WOO_ORDERS_TRACKING_ADMIN_ORDERS_EDIT_TRACKING->admin_enqueue_script() C:\wamp64\www\En\wp-includes\class-wp-hook.php:287
[15-Aug-2020 10:21:18 UTC] PHP 8. VI_WOO_ORDERS_TRACKING_DATA->get_shipping_carrier_url() C:\wamp64\www\En\wp-content\plugins\woo-orders-tracking\includes\admin\orders-edit-tracking.php:983
[15-Aug-2020 10:21:18 UTC] PHP 9. VI_WOO_ORDERS_TRACKING_DATA->get_shipping_carrier_by_slug() C:\wamp64\www\En\wp-content\plugins\woo-orders-tracking\includes\data.php:208
[15-Aug-2020 10:21:28 UTC] PHP Notice: Undefined index: slug in C:\wamp64\www\En\wp-content\plugins\woo-orders-tracking\includes\data.php on line 166
[15-Aug-2020 10:21:28 UTC] PHP Stack trace:
[15-Aug-2020 10:21:28 UTC] PHP 1. {main}() C:\wamp64\www\En\wp-admin\edit.php:0
[15-Aug-2020 10:21:28 UTC] PHP 2. WP_Posts_List_Table->display() C:\wamp64\www\En\wp-admin\edit.php:449
[15-Aug-2020 10:21:28 UTC] PHP 3. WP_Posts_List_Table->display_rows_or_placeholder() C:\wamp64\www\En\wp-admin\includes\class-wp-list-table.php:1249
[15-Aug-2020 10:21:28 UTC] PHP 4. WP_Posts_List_Table->display_rows() C:\wamp64\www\En\wp-admin\includes\class-wp-list-table.php:1322
[15-Aug-2020 10:21:28 UTC] PHP 5. WP_Posts_List_Table->_display_rows() C:\wamp64\www\En\wp-admin\includes\class-wp-posts-list-table.php:728
[15-Aug-2020 10:21:28 UTC] PHP 6. WP_Posts_List_Table->single_row() C:\wamp64\www\En\wp-admin\includes\class-wp-posts-list-table.php:751
[15-Aug-2020 10:21:28 UTC] PHP 7. WP_Posts_List_Table->single_row_columns() C:\wamp64\www\En\wp-admin\includes\class-wp-posts-list-table.php:1304
[15-Aug-2020 10:21:28 UTC] PHP 8. WP_Posts_List_Table->column_default() C:\wamp64\www\En\wp-admin\includes\class-wp-list-table.php:1410
[15-Aug-2020 10:21:28 UTC] PHP 9. do_action() C:\wamp64\www\En\wp-admin\includes\class-wp-posts-list-table.php:1271
[15-Aug-2020 10:21:28 UTC] PHP 10. WP_Hook->do_action() C:\wamp64\www\En\wp-includes\plugin.php:478
[15-Aug-2020 10:21:28 UTC] PHP 11. WP_Hook->apply_filters() C:\wamp64\www\En\wp-includes\class-wp-hook.php:311
[15-Aug-2020 10:21:28 UTC] PHP 12. VI_WOO_ORDERS_TRACKING_ADMIN_ORDERS_TRACK_INFO->manage_shop_order_posts_custom_column() C:\wamp64\www\En\wp-includes\class-wp-hook.php:287
[15-Aug-2020 10:21:28 UTC] PHP 13. VI_WOO_ORDERS_TRACKING_ADMIN_ORDERS_TRACK_INFO->get_shipping_carrier_by_slug() C:\wamp64\www\En\wp-content\plugins\woo-orders-tracking\includes\admin\orders-track-info.php:164
[15-Aug-2020 10:21:28 UTC] PHP 14. VI_WOO_ORDERS_TRACKING_DATA->get_shipping_carrier_by_slug() C:\wamp64\www\En\wp-content\plugins\woo-orders-tracking\includes\admin\orders-track-info.php:114
[15-Aug-2020 10:21:28 UTC] PHP Notice: Undefined index: slug in C:\wamp64\www\En\wp-content\plugins\woo-orders-tracking\includes\data.php on line 166
[15-Aug-2020 10:21:28 UTC] PHP Stack trace:
[15-Aug-2020 10:21:28 UTC] PHP 1. {main}() C:\wamp64\www\En\wp-admin\edit.php:0
[15-Aug-2020 10:21:28 UTC] PHP 2. WP_Posts_List_Table->display() C:\wamp64\www\En\wp-admin\edit.php:449
[15-Aug-2020 10:21:28 UTC] PHP 3. WP_Posts_List_Table->display_rows_or_placeholder() C:\wamp64\www\En\wp-admin\includes\class-wp-list-table.php:1249
[15-Aug-2020 10:21:28 UTC] PHP 4. WP_Posts_List_Table->display_rows() C:\wamp64\www\En\wp-admin\includes\class-wp-list-table.php:1322
[15-Aug-2020 10:21:28 UTC] PHP 5. WP_Posts_List_Table->_display_rows() C:\wamp64\www\En\wp-admin\includes\class-wp-posts-list-table.php:728
[15-Aug-2020 10:21:28 UTC] PHP 6. WP_Posts_List_Table->single_row() C:\wamp64\www\En\wp-admin\includes\class-wp-posts-list-table.php:751
[15-Aug-2020 10:21:28 UTC] PHP 7. WP_Posts_List_Table->single_row_columns() C:\wamp64\www\En\wp-admin\includes\class-wp-posts-list-table.php:1304
[15-Aug-2020 10:21:28 UTC] PHP 8. WP_Posts_List_Table->column_default() C:\wamp64\www\En\wp-admin\includes\class-wp-list-table.php:1410
[15-Aug-2020 10:21:28 UTC] PHP 9. do_action() C:\wamp64\www\En\wp-admin\includes\class-wp-posts-list-table.php:1271
[15-Aug-2020 10:21:28 UTC] PHP 10. WP_Hook->do_action() C:\wamp64\www\En\wp-includes\plugin.php:478
[15-Aug-2020 10:21:28 UTC] PHP 11. WP_Hook->apply_filters() C:\wamp64\www\En\wp-includes\class-wp-hook.php:311
[15-Aug-2020 10:21:28 UTC] PHP 12. VI_WOO_ORDERS_TRACKING_ADMIN_ORDERS_TRACK_INFO->manage_shop_order_posts_custom_column() C:\wamp64\www\En\wp-includes\class-wp-hook.php:287
[15-Aug-2020 10:21:28 UTC] PHP 13. VI_WOO_ORDERS_TRACKING_ADMIN_ORDERS_TRACK_INFO->get_shipping_carrier_by_slug() C:\wamp64\www\En\wp-content\plugins\woo-orders-tracking\includes\admin\orders-track-info.php:164
[15-Aug-2020 10:21:28 UTC] PHP 14. VI_WOO_ORDERS_TRACKING_DATA->get_shipping_carrier_by_slug() C:\wamp64\www\En\wp-content\plugins\woo-orders-tracking\includes\admin\orders-track-info.php:114
[15-Aug-2020 10:21:32 UTC] PHP Notice: Undefined index: slug in C:\wamp64\www\En\wp-content\plugins\woo-orders-tracking\includes\data.php on line 166
[15-Aug-2020 10:21:32 UTC] PHP Stack trace:
[15-Aug-2020 10:21:32 UTC] PHP 1. {main}() C:\wamp64\www\En\wp-admin\edit.php:0
[15-Aug-2020 10:21:32 UTC] PHP 2. WP_Posts_List_Table->display() C:\wamp64\www\En\wp-admin\edit.php:449
[15-Aug-2020 10:21:32 UTC] PHP 3. WP_Posts_List_Table->display_rows_or_placeholder() C:\wamp64\www\En\wp-admin\includes\class-wp-list-table.php:1249
[15-Aug-2020 10:21:32 UTC] PHP 4. WP_Posts_List_Table->display_rows() C:\wamp64\www\En\wp-admin\includes\class-wp-list-table.php:1322
[15-Aug-2020 10:21:32 UTC] PHP 5. WP_Posts_List_Table->_display_rows() C:\wamp64\www\En\wp-admin\includes\class-wp-posts-list-table.php:728
[15-Aug-2020 10:21:32 UTC] PHP 6. WP_Posts_List_Table->single_row() C:\wamp64\www\En\wp-admin\includes\class-wp-posts-list-table.php:751
[15-Aug-2020 10:21:32 UTC] PHP 7. WP_Posts_List_Table->single_row_columns() C:\wamp64\www\En\wp-admin\includes\class-wp-posts-list-table.php:1304
[15-Aug-2020 10:21:32 UTC] PHP 8. WP_Posts_List_Table->column_default() C:\wamp64\www\En\wp-admin\includes\class-wp-list-table.php:1410
[15-Aug-2020 10:21:32 UTC] PHP 9. do_action() C:\wamp64\www\En\wp-admin\includes\class-wp-posts-list-table.php:1271
[15-Aug-2020 10:21:32 UTC] PHP 10. WP_Hook->do_action() C:\wamp64\www\En\wp-includes\plugin.php:478
[15-Aug-2020 10:21:32 UTC] PHP 11. WP_Hook->apply_filters() C:\wamp64\www\En\wp-includes\class-wp-hook.php:311
[15-Aug-2020 10:21:33 UTC] PHP 12. VI_WOO_ORDERS_TRACKING_ADMIN_ORDERS_TRACK_INFO->manage_shop_order_posts_custom_column() C:\wamp64\www\En\wp-includes\class-wp-hook.php:287
[15-Aug-2020 10:21:33 UTC] PHP 13. VI_WOO_ORDERS_TRACKING_ADMIN_ORDERS_TRACK_INFO->get_shipping_carrier_by_slug() C:\wamp64\www\En\wp-content\plugins\woo-orders-tracking\includes\admin\orders-track-info.php:164
[15-Aug-2020 10:21:33 UTC] PHP 14. VI_WOO_ORDERS_TRACKING_DATA->get_shipping_carrier_by_slug() C:\wamp64\www\En\wp-content\plugins\woo-orders-tracking\includes\admin\orders-track-info.php:114
[15-Aug-2020 10:21:33 UTC] PHP Notice: Undefined index: slug in C:\wamp64\www\En\wp-content\plugins\woo-orders-tracking\includes\data.php on line 166
[15-Aug-2020 10:21:33 UTC] PHP Stack trace:
[15-Aug-2020 10:21:33 UTC] PHP 1. {main}() C:\wamp64\www\En\wp-admin\edit.php:0
[15-Aug-2020 10:21:33 UTC] PHP 2. WP_Posts_List_Table->display() C:\wamp64\www\En\wp-admin\edit.php:449
[15-Aug-2020 10:21:33 UTC] PHP 3. WP_Posts_List_Table->display_rows_or_placeholder() C:\wamp64\www\En\wp-admin\includes\class-wp-list-table.php:1249
[15-Aug-2020 10:21:33 UTC] PHP 4. WP_Posts_List_Table->display_rows() C:\wamp64\www\En\wp-admin\includes\class-wp-list-table.php:1322
[15-Aug-2020 10:21:33 UTC] PHP 5. WP_Posts_List_Table->_display_rows() C:\wamp64\www\En\wp-admin\includes\class-wp-posts-list-table.php:728
[15-Aug-2020 10:21:33 UTC] PHP 6. WP_Posts_List_Table->single_row() C:\wamp64\www\En\wp-admin\includes\class-wp-posts-list-table.php:751
[15-Aug-2020 10:21:33 UTC] PHP 7. WP_Posts_List_Table->single_row_columns() C:\wamp64\www\En\wp-admin\includes\class-wp-posts-list-table.php:1304
[15-Aug-2020 10:21:33 UTC] PHP 8. WP_Posts_List_Table->column_default() C:\wamp64\www\En\wp-admin\includes\class-wp-list-table.php:1410
[15-Aug-2020 10:21:33 UTC] PHP 9. do_action() C:\wamp64\www\En\wp-admin\includes\class-wp-posts-list-table.php:1271
[15-Aug-2020 10:21:33 UTC] PHP 10. WP_Hook->do_action() C:\wamp64\www\En\wp-includes\plugin.php:478
[15-Aug-2020 10:21:33 UTC] PHP 11. WP_Hook->apply_filters() C:\wamp64\www\En\wp-includes\class-wp-hook.php:311
[15-Aug-2020 10:21:33 UTC] PHP 12. VI_WOO_ORDERS_TRACKING_ADMIN_ORDERS_TRACK_INFO->manage_shop_order_posts_custom_column() C:\wamp64\www\En\wp-includes\class-wp-hook.php:287
[15-Aug-2020 10:21:33 UTC] PHP 13. VI_WOO_ORDERS_TRACKING_ADMIN_ORDERS_TRACK_INFO->get_shipping_carrier_by_slug() C:\wamp64\www\En\wp-content\plugins\woo-orders-tracking\includes\admin\orders-track-info.php:164
[15-Aug-2020 10:21:33 UTC] PHP 14. VI_WOO_ORDERS_TRACKING_DATA->get_shipping_carrier_by_slug() C:\wamp64\www\En\wp-content\plugins\woo-orders-tracking\includes\admin\orders-track-info.php:114
[15-Aug-2020 10:21:36 UTC] PHP Notice: Undefined index: slug in C:\wamp64\www\En\wp-content\plugins\woo-orders-tracking\includes\data.php on line 166
[15-Aug-2020 10:21:36 UTC] PHP Stack trace:
[15-Aug-2020 10:21:36 UTC] PHP 1. {main}() C:\wamp64\www\En\wp-admin\post.php:0
[15-Aug-2020 10:21:36 UTC] PHP 2. require() C:\wamp64\www\En\wp-admin\post.php:206
[15-Aug-2020 10:21:36 UTC] PHP 3. require_once() C:\wamp64\www\En\wp-admin\edit-form-advanced.php:423
[15-Aug-2020 10:21:36 UTC] PHP 4. do_action() C:\wamp64\www\En\wp-admin\admin-header.php:102
[15-Aug-2020 10:21:36 UTC] PHP 5. WP_Hook->do_action() C:\wamp64\www\En\wp-includes\plugin.php:478
[15-Aug-2020 10:21:36 UTC] PHP 6. WP_Hook->apply_filters() C:\wamp64\www\En\wp-includes\class-wp-hook.php:311
[15-Aug-2020 10:21:36 UTC] PHP 7. VI_WOO_ORDERS_TRACKING_ADMIN_ORDERS_EDIT_TRACKING->admin_enqueue_script() C:\wamp64\www\En\wp-includes\class-wp-hook.php:287
[15-Aug-2020 10:21:36 UTC] PHP 8. VI_WOO_ORDERS_TRACKING_DATA->get_shipping_carrier_url() C:\wamp64\www\En\wp-content\plugins\woo-orders-tracking\includes\admin\orders-edit-tracking.php:983
[15-Aug-2020 10:21:36 UTC] PHP 9. VI_WOO_ORDERS_TRACKING_DATA->get_shipping_carrier_by_slug() C:\wamp64\www\En\wp-content\plugins\woo-orders-tracking\includes\data.php:208
[15-Aug-2020 10:21:42 UTC] PHP Notice: Undefined index: slug in C:\wamp64\www\En\wp-content\plugins\woo-orders-tracking\includes\data.php on line 166
[15-Aug-2020 10:21:42 UTC] PHP Stack trace:
[15-Aug-2020 10:21:42 UTC] PHP 1. {main}() C:\wamp64\www\En\wp-admin\post.php:0
[15-Aug-2020 10:21:42 UTC] PHP 2. require() C:\wamp64\www\En\wp-admin\post.php:206
[15-Aug-2020 10:21:42 UTC] PHP 3. require_once() C:\wamp64\www\En\wp-admin\edit-form-advanced.php:423
[15-Aug-2020 10:21:42 UTC] PHP 4. do_action() C:\wamp64\www\En\wp-admin\admin-header.php:102
[15-Aug-2020 10:21:42 UTC] PHP 5. WP_Hook->do_action() C:\wamp64\www\En\wp-includes\plugin.php:478
[15-Aug-2020 10:21:42 UTC] PHP 6. WP_Hook->apply_filters() C:\wamp64\www\En\wp-includes\class-wp-hook.php:311
[15-Aug-2020 10:21:42 UTC] PHP 7. VI_WOO_ORDERS_TRACKING_ADMIN_ORDERS_EDIT_TRACKING->admin_enqueue_script() C:\wamp64\www\En\wp-includes\class-wp-hook.php:287
[15-Aug-2020 10:21:42 UTC] PHP 8. VI_WOO_ORDERS_TRACKING_DATA->get_shipping_carrier_url() C:\wamp64\www\En\wp-content\plugins\woo-orders-tracking\includes\admin\orders-edit-tracking.php:983
[15-Aug-2020 10:21:42 UTC] PHP 9. VI_WOO_ORDERS_TRACKING_DATA->get_shipping_carrier_by_slug() C:\wamp64\www\En\wp-content\plugins\woo-orders-tracking\includes\data.php:208

this is backup copy my site in localhost

I resolved This

in Functions.js change

“if (data[i].name.toLowerCase() > data[j].name.toLowerCase()) ” to “if (data[i] > data[j]) ”

Good to hear that.
But it’s not the source of the problem. There are a lot of “undefined index” warnings from our plugin and this is because a new carrier was added incorrectly. Did you use any php code to change carriers?