Dokan pro v2.9.11 about wepos HOT 4 OPEN

Other line in same php file and others.

dokan_get_lot_discount_for_vendor() at docroot\wp-content\plugins\dokan-pro\includes\wc-functions.php: 916
set_discount_on_sub_orders() at docroot\wp-content\plugins\dokan-pro\includes\wc-functions.php: 884
WP_Hook::apply_filters() at docroot\wp-includes\class-wp-hook.php: 286
WP_Hook::do_action() at docroot\wp-includes\class-wp-hook.php: 310
do_action() at docroot\wp-includes\plugin.php: 465
Dokan_Order_Manager::maybe_split_orders() at docroot\wp-content\plugins\dokan-lite\includes\class-order-manager.php: 182
Dokan_REST_Order_Controller::after_order_create() at docroot\wp-content\plugins\dokan-lite\includes\api\class-order-controller.php: 807
WP_Hook::apply_filters() at docroot\wp-includes\class-wp-hook.php: 288
WP_Hook::do_action() at docroot\wp-includes\class-wp-hook.php: 310
do_action() at docroot\wp-includes\plugin.php: 465
WC_REST_CRUD_Controller::create_item() at docroot\wp-content\plugins\woocommerce\includes\abstracts\abstract-wc-rest-crud-controller.php: 214
WP_REST_Server::dispatch() at docroot\wp-includes\rest-api\class-wp-rest-server.php: 946
WP_REST_Server::serve_request() at docroot\wp-includes\rest-api\class-wp-rest-server.php: 329
rest_api_loaded() at docroot\wp-includes\rest-api.php: 309
WP_Hook::apply_filters() at docroot\wp-includes\class-wp-hook.php: 286
WP_Hook::do_action() at docroot\wp-includes\class-wp-hook.php: 310
do_action_ref_array() at docroot\wp-includes\plugin.php: 531
WP::parse_request() at docroot\wp-includes\class-wp.php: 387
WP::main() at docroot\wp-includes\class-wp.php: 737
wp() at docroot\wp-includes\functions.php: 1105
require() at docroot\wp-blog-header.php: 16
main() at docroot\index.php: 17

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in console

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Failed to load resource: the server responded with a status of 500 (Internal Server Error)
frontend.min.js?ver=1564516746:1 Uncaught TypeError: Cannot read property 'message' of undefined
at Object. (frontend.min.js?ver=1564516746:1)
at i (jquery.js?ver=1.12.4-wp:2)
at Object.fireWith [as rejectWith] (jquery.js?ver=1.12.4-wp:2)
at x (jquery.js?ver=1.12.4-wp:4)
at XMLHttpRequest.c (jquery.js?ver=1.12.4-wp:4)

from wepos.

Hi.
How can I create a coupon in woocommerce dashboard and works for all vendors?
When I create a coupon I get this message when I apply my coupon code:
A coupon must be restricted with a vendor product.
(Think is like I want to make a discount for all products from my commission)
{If I have 25% commission I’d like to make a coupon for vendors products with 25% coupon or gift code}
How Can I solve it?
Thanks

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