I am facing problem when using Interpolate. When  I try live preview, then an error message occurred.

interp.py:115: SyntaxWarning: "is" with a literal. Did you mean "=="?
  if strokestyle is 'color':
interp.py:125: SyntaxWarning: "is" with a literal. Did you mean "=="?
  if fillstyle is 'color':
Traceback (most recent call last):
  File "interp.py", line 30, in <module>
    from inkex.bezier import csplength, cspbezsplitatlength, cspbezsplit, bezlenapprx
  File "C:\Program Files\Inkscape\share\inkscape\extensions\inkex\bezier.py", line 29, in <module>
    import numpy
  File "C:\Program Files\Inkscape\lib\python3.8\site-packages\numpy\__init__.py", line 140, in <module>
    from . import core
  File "C:\Program Files\Inkscape\lib\python3.8\site-packages\numpy\core\__init__.py", line 101, in <module>
    from . import _internal
  File "C:\Program Files\Inkscape\lib\python3.8\site-packages\numpy\core\_internal.py", line 14, in <module>
    import ctypes
  File "C:\Program Files\Inkscape\lib\python3.8\ctypes\__init__.py", line 457, in <module>
    pythonapi = PyDLL("libpython%d.%d%s.dll" % (_sys.version_info[:2] + (_sys.abiflags,)), None)
  File "C:\Program Files\Inkscape\lib\python3.8\ctypes\__init__.py", line 373, in __init__
    self._handle = _dlopen(self._name, mode)
OSError: [WinError 87] The parameter is incorrect

Describe your OS & version, the version of Inkscape and the installer you used, plus any special hardware like tablet/stylus or multiple monitors..