Hi Chandrika,
It seems that you need to force entering into bootloader mode before running your application (that uses the same UART). Please refer to the following links for additional details and troubleshooting:
http://forum.flashmagictool.com/index.php?topic=3424.0
http://forum.flashmagictool.com/index.php?topic=3628.0
Hope this will be useful for you.
Best regards!
/Carlos
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