创建 群组 用户不存在

我已经在环信里面注册了账户 ，
然后使用账户去注册群组，始终提示“用户不存在”
 
body内容 ：{"groupname": "测试的群","desc": "测试的群","public": true,"maxusers": 300,"approval":true,"owner": "1234654886","members": ["1234654885"]}
 
提交后返回结果：
{"error":"json_parse","timestamp":1494168220903,"duration":0,"exception":"org.codehaus.jackson.JsonParseException","error_description":"Invalid UTF-8 start byte 0xb2\n at [Source: java.io.BufferedInputStream@24cff54a; line: 1, column: 17]"}