New Order API ERROR

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[20-Apr-2020 08:02:45 UTC] PHP Warning:  call_user_func_array() expects parameter 1 to be a valid callback, no array or string given in C:\wamp64\www\wcfm\wp-includes\class-wp-hook.php on line 287
[20-Apr-2020 08:02:45 UTC] PHP Stack trace:
[20-Apr-2020 08:02:45 UTC] PHP   1. {main}() C:\wamp64\www\wcfm\index.php:0
[20-Apr-2020 08:02:45 UTC] PHP   2. require() C:\wamp64\www\wcfm\index.php:17
[20-Apr-2020 08:02:45 UTC] PHP   3. wp() C:\wamp64\www\wcfm\wp-blog-header.php:16
[20-Apr-2020 08:02:45 UTC] PHP   4. WP->main() C:\wamp64\www\wcfm\wp-includes\functions.php:1274
[20-Apr-2020 08:02:45 UTC] PHP   5. WP->parse_request() C:\wamp64\www\wcfm\wp-includes\class-wp.php:735
[20-Apr-2020 08:02:45 UTC] PHP   6. do_action_ref_array() C:\wamp64\www\wcfm\wp-includes\class-wp.php:388
[20-Apr-2020 08:02:45 UTC] PHP   7. WP_Hook->do_action() C:\wamp64\www\wcfm\wp-includes\plugin.php:544
[20-Apr-2020 08:02:45 UTC] PHP   8. WP_Hook->apply_filters() C:\wamp64\www\wcfm\wp-includes\class-wp-hook.php:311
[20-Apr-2020 08:02:45 UTC] PHP   9. rest_api_loaded() C:\wamp64\www\wcfm\wp-includes\class-wp-hook.php:287
[20-Apr-2020 08:02:45 UTC] PHP  10. WP_REST_Server->serve_request() C:\wamp64\www\wcfm\wp-includes\rest-api.php:306
[20-Apr-2020 08:02:45 UTC] PHP  11. WP_REST_Server->dispatch() C:\wamp64\www\wcfm\wp-includes\rest-api\class-wp-rest-server.php:342
[20-Apr-2020 08:02:45 UTC] PHP  12. WC_REST_Orders_Controller->create_item() C:\wamp64\www\wcfm\wp-includes\rest-api\class-wp-rest-server.php:1015
[20-Apr-2020 08:02:45 UTC] PHP  13. WC_REST_Orders_Controller->update_additional_fields_for_object() C:\wamp64\www\wcfm\wp-content\plugins\woocommerce\packages\woocommerce-rest-api\src\Controllers\Version3\class-wc-rest-crud-controller.php:198
[20-Apr-2020 08:02:45 UTC] PHP  14. WC_POS_APIv2_Orders->update_payment_details() C:\wamp64\www\wcfm\wp-includes\rest-api\endpoints\class-wp-rest-controller.php:486
[20-Apr-2020 08:02:45 UTC] PHP  15. WooCommerce->init() C:\wamp64\www\wcfm\wp-content\plugins\woocommerce-pos\includes\apiv2\class-wc-pos-orders.php:180
[20-Apr-2020 08:02:45 UTC] PHP  16. WooCommerce->is_request() C:\wamp64\www\wcfm\wp-content\plugins\woocommerce\includes\class-woocommerce.php:562
[20-Apr-2020 08:02:45 UTC] PHP  17. WooCommerce->is_rest_api_request() C:\wamp64\www\wcfm\wp-content\plugins\woocommerce\includes\class-woocommerce.php:304
[20-Apr-2020 08:02:45 UTC] PHP  18. apply_filters() C:\wamp64\www\wcfm\wp-content\plugins\woocommerce\includes\class-woocommerce.php:286
[20-Apr-2020 08:02:45 UTC] PHP  19. WP_Hook->apply_filters() C:\wamp64\www\wcfm\wp-includes\plugin.php:206