Telemetry Xbee Communication Error With MissionPlanner

I have a problem communicating to the ground station using Xbee modules. After clicking on connect, it tries to communicate then waits 30 seconds and finishes with an error message: 

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Your serial links is not fast enough.

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both Xbee modules are set correctly and work perfectly (see attachment)

I changed the baud rate (in both Xbee's, firmware and MissionPlanner) to 38400 but still the same problem. Still not sure if it is a hardware or a software problem. I thought it could be a circuit noise so i disconnect all sensors from the board keeping only the xbee but that still not changing any thing. this disappointed me the who day. If anybody have the same problem please let me know.

I am using the flowing hardware/software:

Xbee modules: 2.4GHz XBee XBP24-AWI-001:  http://www.sparkfun.com/products/8742

Xbee explorer on laptop side:    http://www.sparkfun.com/products/8687

Xbee explorer on ArduCopter side: http://www.sparkfun.com/products/9132

ArduCopter firmware: ArduCopter-2.5.5

Mission Planner 1.1.92

xbee1.JPG

xbee2.JPG

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