Getting error while flashing the code with CC2538 MCU - reg

Hi all,

I have developed a code for CC2538 MCU with IAR IDE. I am using i-jet debugger device for debugging. 

while I am trying to flash the code, I have got the error like Fatal Error: Failed to connect to CPU. Session Aborted. I have checked the USB cable connections also. What will be the problem? Help me to solve this problem. Thanks in advance.