AVOS Android 客户端，配置参照官方 demo ，运行的时候总是：

E/com.avos.avospush.push.AVPushConnectionManager﹕ Get expiration date error.
org.json.JSONException: No value for _expiration_time
at org.json.JSONObject.get(JSONObject.java:354)
at org.json.JSONObject.getString(JSONObject.java:510)
at com.avos.avospush.push.AVPushConnectionManager.getExpiration(AVPushConnectionManager.java:357)
at com.avos.avospush.push.AVPushConnectionManager.processMessage(AVPushConnectionManager.java:375)
at com.avos.avospush.push.AVPushConnectionManager.access$100(AVPushConnectionManager.java:42)
at com.avos.avospush.push.AVPushConnectionManager$AVPushWebSocketClient.onMessage(AVPushConnectionManager.java:169)
at org.java_websocket.client.WebSocketClient.onWebsocketMessage(WebSocketClient.java:248)
at org.java_websocket.WebSocketImpl.decodeFrames(WebSocketImpl.java:375)
at org.java_websocket.WebSocketImpl.decode(WebSocketImpl.java:158)
at org.java_websocket.client.WebSocketClient.run(WebSocketClient.java:185)
at java.lang.Thread.run(Thread.java:856)

如有碰见类似情况，还望不吝指导！