Programming XC866

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I am using XC866 microcontroller to develop a VFD for BLDC Motor.
I have developed a custom board( VFD ) which uses XC866 this microcontroller for this application .
I was able to programme the chip for the first time using FLOAD tool provided to me, But when I try to programme the chip for the 2nd time it gives error.
The error says " Error during downloading . Connection is closed"
I also tried to program the flash using MEMTOOL several times and got some Bootloader related error, Which I am trying to understand.

Kindly, need your help..

I have attached the snapshot of error below:
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