WhyCan Forum(哇酷开发者社区)

请问有谁知道这个问题怎么解决吗？万分感谢！

root@ubuntu:/esp32/demos/hello_world# make flash
Toolchain path: /esp32/crossTools/xtensa-esp32-elf/bin/xtensa-esp32-elf-gcc
Toolchain version: crosstool-ng-1.22.0-80-g6c4433a
Compiler version: 5.2.0
Python requirements from /esp32/sources/esp-idf/requirements.txt are satisfied.
Flashing binaries to serial port /dev/ttyS4 (app at offset 0x10000)...
esptool.py v2.6-beta1
Serial port /dev/ttyS4
Traceback (most recent call last):
  File "/esp32/sources/esp-idf/components/esptool_py/esptool/esptool.py", line 2865, in <module>
    _main()
  File "/esp32/sources/esp-idf/components/esptool_py/esptool/esptool.py", line 2858, in _main
    main()
  File "/esp32/sources/esp-idf/components/esptool_py/esptool/esptool.py", line 2565, in main
    esp = chip_class(each_port, initial_baud, args.trace)
  File "/esp32/sources/esp-idf/components/esptool_py/esptool/esptool.py", line 213, in __init__
    self._port = serial.serial_for_url(port)
  File "/usr/lib/python2.7/dist-packages/serial/__init__.py", line 88, in serial_for_url
    instance.open()
  File "/usr/lib/python2.7/dist-packages/serial/serialposix.py", line 272, in open
    self._reconfigure_port(force_update=True)
  File "/usr/lib/python2.7/dist-packages/serial/serialposix.py", line 326, in _reconfigure_port
    raise SerialException("Could not configure port: {}".format(msg))
serial.serialutil.SerialException: Could not configure port: (5, 'Input/output error')
/esp32/sources/esp-idf/components/esptool_py/Makefile.projbuild:62: recipe for target 'flash' failed