I am having this same issue.. I have all the Woocommerce server environment modules installed. Any ideas? It occurs when I click “Buy and Print” everything up to that point seems to work great and you have a very slick user interface! hoping this can be fixed.
wcc_server_error_response Error: The WooCommerce Services server returned: Internal Server Error An internal server error occurred ( 500 ) (WC_REST_Connect_Shipping_Label_Controller)