How to interface Xadow IMU 6DOF with Linkit Assist 2502

Hi,

I have been trying to interface the Xadow IMU 6DOF with Linkit Assist 2502 without much success. Has anyone tried this? I keep getting I2C write failed (error code -21). I tried with another Xadow IMU board and still get the same error. I have managed to interface GY521 by using the pin headers using I2C.
To double check my connection, a pic describing the connection would be very much appreciated.

Thanks