Configuring FlashMon51 for AT89C51RE2

I tried to configure the FlashMon51 monitor program available with keil. After Flashing the hex file and tried to do debugging, Keil is not able to detect the debugger. I am getting the error that "Connection to target lost".
Please help me in configuring the FlashMon51 or any other suggestions for executing the debugger scripts on the target.

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