I installed ROS Noetic in windows 10 as explained in http://wiki.ros.org/Installation/Windows. And I want to run the demo in the tutorial of moveit. After I check roslaunch pandamoveit_config demo.launch I got the error:

 Python path configuration:
  PYTHONHOME = (not set)
  PYTHONPATH = 'c:\opt\ros\noetic\x64\lib/site-packages;c:\opt\ros\noetic\x64\Lib\site-packages'
  program name = 'python.exe'
  isolated = 0
  environment = 1
  user site = 1
  import site = 1
  sys._base_executable = 'C:\\Users\\LENOVO\\venv\\Scripts\\python.exe'
  sys.base_prefix = ''
  sys.base_exec_prefix = ''
  sys.executable = 'C:\\Users\\LENOVO\\venv\\Scripts\\python.exe'
  sys.prefix = ''
  sys.exec_prefix = ''
  sys.path = [
    'c:\\opt\\ros\\noetic\\x64\\lib/site-packages',
    'c:\\opt\\ros\\noetic\\x64\\Lib\\site-packages',
    'C:\\Users\\LENOVO\\venv\\Scripts\\python38.zip',
    'g:\\python',
  ]
Fatal Python error: init_fs_encoding: failed to get the Python codec of the filesystem encoding
Python runtime state: core initialized
ModuleNotFoundError: No module named 'encodings'

Current thread 0x000033d8 (most recent call first):
<no Python frame>

I see other solutions proposed for similar problems，such as delete python38.dll or use new release. but I have use the latest release and there is no 'python38.dll' in my packege 'c:\opt\ros\noetic\x64\bin' I dont know how to deal with it.