Esp-idf: Windows 10: use msys2_shell download error

[eboxmaker]

Flashing project app to 0x10000...
esptool.py v2.0-dev
Traceback (most recent call last):
  File "C:/esp32_idf/esp-idf/components/esptool_py/esptool/esptool.py", line 1813, in <module>
    main()
  File "C:/esp32_idf/esp-idf/components/esptool_py/esptool/esptool.py", line 1642, in main
    esp = chip_constructor_fun(args.port, initial_baud)
  File "C:/esp32_idf/esp-idf/components/esptool_py/esptool/esptool.py", line 159, in __init__
    self._port = serial.Serial(port)
  File "C:/msys32/mingw32/lib/python2.7/site-packages/serial/serialwin32.py", line 31, in __init__
    super(Serial, self).__init__(*args, **kwargs)
  File "C:/msys32/mingw32/lib/python2.7/site-packages/serial/serialutil.py", line 182, in __init__
    self.open()
  File "C:/msys32/mingw32/lib/python2.7/site-packages/serial/serialwin32.py", line 62, in open
    raise SerialException("could not open port {!r}: {!r}".format(self.portstr, ctypes.WinError()))
serial.serialutil.SerialException: could not open port '/??/COM3': WindowsError(3, '\xcf\xb5\xcd\xb3\xd5\xd2\xb2\xbb\xb5\xbd\xd6\xb8\xb6\xa8\xb5\xc4\xc2\xb7\xbe\xb6\xa1\xa3')
make: *** [C:/esp32_idf/esp-idf/components/esptool_py/Makefile.projbuild:28：flash] 错误 1

could not open port '/??/COM3': What I can do to solve this problem ?
COM3 is usb to serial port, the chip model is cp2102

[negativekelvin]

I saw this when i first tried also. Is your port defined in menuconfig as COM3 and not the msys port /dev/ttyS2? Is a terminal program using the port? Have you done a git pull && git submodule update? I can't remember how I got it to go away.

[eboxmaker]

yes，you are right，Modify /dev/ttyS2 to / COM3 just fine.
thank you。