群里有295人，调用api的参数add_user_list传过去15人，但是返回结果是群成员数过多或过少

{"errcode":86006,"errmsg":"invalid chat member list size, hint: [1583754635_77_197da12c4354e149fdfb55d618996029], from ip: 124.193.75.34, more info at https://open.work.weixin.qq.com/devtool/query?e=86006"}