FCM Error 406 , Received acks for messages not sent over this connection

[lun167]

Hi,
connected to google FCM,

jaxl_loop:112 - 2017-05-05 04:13:01 - Unwatch: active read fds: 1, write fds: 0
jaxl_socket_client:230 - 2017-05-05 04:13:01 - read 293/17664 of data
jaxl_socket_client:232 - 2017-05-05 04:13:01 - <data:gcm xmlns:data="google:mobile:data">{"message_type":"ack","from":"cH1fWyJNyIk:AP ......","message_id":"0.82740900 1493957581"}</data:gcm>
jaxl_fsm:66 - 2017-05-05 04:13:01 - calling state handler 'logged_in' for incoming event 'stanza_cb'
jaxl_loop:89 - 2017-05-05 04:13:01 - Watch: active read fds: 1, write fds: 1
jaxl_fsm:88 - 2017-05-05 04:13:01 - current state 'logged_in'
jaxl_socket_client:248 - 2017-05-05 04:13:01 - sent 282/19494 of data
jaxl_socket_client:249 - 2017-05-05 04:13:01 - {"to":"cH1fWyJNyIk:AP ......","message_type":"ack","message_id":"0.82740900 1493957581"}
jaxl_loop:112 - 2017-05-05 04:13:01 - Unwatch: active read fds: 1, write fds: 0
jaxl_socket_client:230 - 2017-05-05 04:13:01 - read 584/18248 of data
jaxl_socket_client:232 - 2017-05-05 04:13:01 - {"to":"cH1fWyJNyIk:AP ......","message_type":"ack","message_id":"0.82740900 1493957581"}<error code="406" type="modify">Received acks for messages not sent over this connection
jaxl_fsm:66 - 2017-05-05 04:13:01 - calling state handler 'logged_in' for incoming event 'stanza_cb'
jaxl_fsm:88 - 2017-05-05 04:13:01 - current state 'logged_in'
jaxl_socket_client:230 - 2017-05-05 04:13:01 - read 16/18264 of data
jaxl_socket_client:232 - 2017-05-05 04:13:01 - </stream:stream>
jaxl_fsm:66 - 2017-05-05 04:13:01 - calling state handler 'logged_in' for incoming event 'end_cb'
jaxl_loop:89 - 2017-05-05 04:13:01 - Watch: active read fds: 1, write fds: 1
jaxl_fsm:88 - 2017-05-05 04:13:01 - current state 'logged_out'
jaxl_socket_client:217 - 2017-05-05 04:13:01 - socket eof, disconnecting
jaxl_loop:112 - 2017-05-05 04:13:01 - Unwatch: active read fds: 0, write fds: 1
jaxl_loop:112 - 2017-05-05 04:13:01 - Unwatch: active read fds: 0, write fds: 0
jaxl_loop:125 - 2017-05-05 04:13:01 - no more active fd's to select
jaxl_test2:30 - 2017-05-05 04:13:01 - ****** on_disconnect ******
jaxl:250 - 2017-05-05 04:13:01 - cleaning up pid and unix sock files
jaxl_loop:112 - 2017-05-05 04:13:01 - Unwatch: active read fds: 0, write fds: 0
jaxl_clock:58 - 2017-05-05 04:13:01 - shutting down clock server...

Thanks a lot!