Error Create in Bulk Labels

Hi, when we try to create in bulk labels, to generate the awbs, we get a white page with error, and over email we get this:

Error Details

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An error of type E_ERROR was caused in line 1200 of the file /home/xxx/public_html/wp-content/plugins/dhl-for-woocommerce/includes/abstract-pr-dhl-wc-order.php. Error message: Uncaught Error: Call to undefined method PR_DHL_API_Deutsche_Post::get_dhl_labels() in /home/xxx/public_html/wp-content/plugins/dhl-for-woocommerce/includes/abstract-pr-dhl-wc-order.php:1200

Stack trace:

#0 /home/xxx/public_html/wp-content/plugins/dhl-for-woocommerce/includes/class-pr-dhl-wc-order-deutsche-post.php(1036): PR_DHL_WC_Order->process_bulk_actions('pr_dhl_create_l...', Array, 5, false, false)

#1 /home/xxx/public_html/wp-content/plugins/dhl-for-woocommerce/includes/abstract-pr-dhl-wc-order.php(1016): PR_DHL_WC_Order_Deutsche_Post->process_bulk_actions('pr_dhl_create_l...', Array, 5)

#2 /home/xxx/public_html/wp-includes/class-wp-hook.php(308): PR_DHL_WC_Order->process_orders_bulk_actions('')

#3 /home/xxx/public_html/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters(NULL, Array)

#4 /home/xxx/public_html/wp-includes/plugin.php(517): WP_Hook->do_action(Array)

#5 /home/xxx/public_html/wp-admin/admin.php(385): do_action('load-edit.php')

#6 /home/rxxx/public

right now is working in our side just one by one. thank you,