RTL 8721-DM flashing problem

Hi,
I have follow the “AN0400 Ameba-D Application Note” to setup the develop environment.
But, I get problem in the “flash download” by using “make flash” command.
Does anyone have idea?
Here is my develop environment information:
OS: Windows 10 x64
SEGGER J-Link GDB Server V6.98 GUI Version
Cygwin: GNU bash, version 4.4.12(3)-release (i686-pc-cygwin)
image

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GDB didn’t init correctly, please check that your JLINK script is correct according to your setup

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