problem with xbee-api for XBEE SERIE 1

HI ,
please i’m trying to use the xbee-api library to run my codes, but i tried version O.9 , version 0.5.5 and 0.5.1 (run on eclipse )getting always this exception.
(I’m using xbee 802.15.4 s1 attached to arduino xbee shield attached to arduino)

Exception in thread “main” com.rapplogic.xbee.api.XBeeTimeoutException
at com.rapplogic.xbee.api.XBee.sendSynchronous(XBee.java:236)
at com.rapplogic.xbee.api.XBee.sendAtCommand(XBee.java:159)
at com.rapplogic.xbee.examples.ApiAtTest.(ApiAtTest.java:74)
at com.rapplogic.xbee.examples.ApiAtTest.main(ApiAtTest.java:108)
[2013-05-18 14:36:06,723] [XBee Packet Parser Thread] [WARN] [com.rapplogic.xbee.api.XBeePacketParser] Packet parser thread was interrupted
[2013-05-18 14:36:06,724] [XBee Packet Parser Thread] [WARN] [com.rapplogic.xbee.api.XBeePacketParser] Packet parser thread is exiting

Could anyone help me please with a solution :frowning:
Thank you !