python main.py --help出现错误 求解答

[SamWang8888]

是啥原因呀。求解答555
PS Z:\MediaCrawler-main> python main.py --help
Traceback (most recent call last):
File "main.py", line 15, in
import cmd_arg
File "Z:\MediaCrawler-main\cmd_arg_init_.py", line 12, in
from .arg import *
File "Z:\MediaCrawler-main\cmd_arg\arg.py", line 15, in
from tools.utils import str2bool
File "Z:\MediaCrawler-main\tools\utils.py", line 15, in
from .crawler_util import *
File "Z:\MediaCrawler-main\tools\crawler_util.py", line 26, in
import httpx
ModuleNotFoundError: No module named 'httpx'
PS Z:\MediaCrawler-main>