On LPC 2138 boards -SECTORS ERASING PROBLEM

Hi

I am downloading my application using LPC2000 v2.2.1 on to lpc2138 board with flash 512k.And insted of deleting entire device(flash) i am selecting particular sectors to be deleted(for example 0-14)but it is not allowing me to do and it is throwing an error "cannot communicate with test board" and at the down it is displaying "lpc2000 flash erase failed".

Please suggest me how to solve this problem

Thanks
Reddy

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