W/System.err: com.baidu.aip.face.turnstile.exception.FaceError: param[user_id] is null
W/System.err:     at com.baidu.aip.face.turnstile.utils.RegResultParser.parse(RegResultParser.java:20)
                  at com.baidu.aip.face.turnstile.utils.RegResultParser.parse(RegResultParser.java:12)
W/System.err:     at com.baidu.aip.face.turnstile.utils.HttpUtil$1.onResponse(HttpUtil.java:96)
W/System.err:     at okhttp3.RealCall$AsyncCall.execute(RealCall.java:135)
                  at okhttp3.internal.NamedRunnable.run(NamedRunnable.java:32)
                  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
                  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
                  at java.lang.Thread.run(Thread.java:760)

显示user_id为空，但是我用的官方的final String uid = UUID.randomUUID().toString().substring(0, 8) + "_123";  请问应该怎么解决？