subscribeMessage.send data.character_string2 报错？

请求参数如下

{“data”:{“keyword3”:{“value”:“11111”},“keyword4”:{“value”:“您订购的商品已到货，请在今天之内到店自提哦”},“keyword1”:{“value”:“Q20191211105926432XXXXXX “},“keyword2”:{“value”:“测试店”}},“page”:“pages/subPages/order/index”,“template_id”:”xxxxxxxxxxxxxxxxxxxxx”,“touser”:“xxxxxxxxxxxxx”}

返回数据如下

{“errcode”:47003,“errmsg”:“argument invalid! hint: [K0ZIiA00814119] data.character_string2.value i”}