请问创建群组的接口传的members是否有限制？我先后2次传的数据格式一致，但是数据量不一样，一次成功一次不成功，为什么？

第一次成功传入的数据如下：
{"groupname": "2015级二班","desc": "2015级二班","public":true,"approval":true,"owner":"cs_2015002","members": ["cs_201502001","cs_2015001","cs_2015002"]}


第二次失败的格式如下：
{"groupname": "2012级四班","desc": "2012级四班","public":true,"approval":true,"owner":"wq_001","members": ["wq_20120401","wq_20120402","wq_20120403","wq_20120404","wq_20120405","wq_20120406","wq_20120407","wq_20120408","wq_20120409","wq_20120410","wq_20120411","wq_20120412","wq_20120413","wq_20120414","wq_20120415","wq_20120416","wq_20120417","wq_20120418","wq_20120419","wq_20120420","wq_20120421","wq_20120422","wq_20120423","wq_20120424","wq_20120425","wq_20120426","wq_20120427","wq_20120428","wq_20120429","wq_20120430","wq_20120431","wq_20120432","wq_20120433","wq_20120434","wq_20120435","wq_20120436","wq_20120437","wq_20120438","wq_20120439","wq_001","wq_011","wq_013","wq_019"]}

请问我该如何处理？