Pushwoosh - able to send message but cannot register device


I followed the steps in https://success.outsystems.com/Documentation/Development_FAQs/How_to_Use_Push_Notifications_with_Pushwoosh and able to send messages using the api "SendPushNotificationToAll" in the Pushwoosh Plugin.

I am having issue to register all my android devices with below error, do you have any idea? 

One more founding, i tried to register the device manually but I cannot get the "Device Push Token" by calling RegisterDevice

I checked from the /OutSystemsNowService/UserDevice_List.aspx, the "Push Token" of my device is unknown. Is this the reason why i cannot register my device? 

Any one can help here?