No module named '_curses'

I got this error after I called ptop
```
PS C:\\> ptop
Traceback (most recent call last):
File "C:\Python39\Scripts\ptop-script.py", line 33, in
sys.exit(load_entry_point('ptop==1.1', 'console_scripts', 'ptop')())
File "C:\Python39\Scripts\ptop-script.py", line 25, in importlib_load_entry_point
return next(matches).load()
File "C:\Python39\lib\importlib\metadata.py", line 77, in load
module = import_module(match.group('module'))
File "C:\Python39\lib\importlib\__init__.py", line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "", line 1030, in _gcd_import
File "", line 1007, in _find_and_load
File "", line 986, in _find_and_load_unlocked
File "", line 680, in _load_unlocked
File "", line 790, in exec_module
File "", line 228, in _call_with_frames_removed
File "C:\Python39\lib\site-packages\ptop-1.1-py3.9.egg\ptop\main.py", line 13, in
from ptop.interfaces import PtopGUI
File "C:\Python39\lib\site-packages\ptop-1.1-py3.9.egg\ptop\interfaces\__init__.py", line 1, in
from .GUI import PtopGUI
File "C:\Python39\lib\site-packages\ptop-1.1-py3.9.egg\ptop\interfaces\GUI.py", line 6, in
import npyscreen, math, drawille
File "", line 259, in load_module
File "C:\Python39\lib\site-packages\npyscreen-4.10.5-py3.9.egg\npyscreen\__init__.py", line 5, in
File "", line 259, in load_module
File "C:\Python39\lib\site-packages\npyscreen-4.10.5-py3.9.egg\npyscreen\wgwidget.py", line 5, in
File "C:\Python39\lib\curses\__init__.py", line 13, in
from _curses import *
ModuleNotFoundError: No module named '_curses'
```
**windows 10**
**python 3**

so whats worng?