电子面单取号，报错提示“收件人姓名不能为空”，但是收件人是填写了姓名，请问这是为什么？

【POST】请求url:https://api.weixin.qq.com/channels/ec/logistics/ewaybill/biz/order/create?access_token=*

请求数据:{"delivery_id":"STO","ec_order_list":[{"ec_order_id":3723624540207711488,"goods_list":[{"good_count":1,"good_name":"1.5斤大果","out_product_id":"1.5斤大果","product_id":10000159142185,"sku_id":2670424478}]}],"ewaybill_acct_id":"6634620822","ewaybill_order_id":"3703850035226869767","ext_info":null,"order_type":1,"receiver":{"address":"解放东街保安楼201","city":"巴彦淖尔市","county":"临河区","mobile":"有对应的值","name":"丽英","province":"内蒙古自治区","street":""},"remark":"","return_address":{"address":"","city":"","county":"","mobile":"","name":"","province":"","street":""},"sender":{"address":"鲁山路18号福达厂区桂林糖美人贸易有限公司","city":"桂林市","county":"临桂区","mobile":"有对应的值","name":"李先生","province":"广西壮族自治区","street":""},"shop_id":"5009833961545","site_code":"541100","template_id":"6634199490"}

{"errcode":10025005,"errmsg":"电子面单取号失败，请参考delivery_error_msg字段后重试 rid: 67233810-735b9929-60a1bf2d","delivery_error_msg":"收件人姓名不能为空"}