HTTP Error 403: Unauthorized for Udemy

[isrgannr]

Hi;

I am using Youtube-dl for downloaded udemy courses but I have a problem. I am entering my account username and password but I get this problem:

Command : youtube-dl -u mail@gmail.com -p password -o "./%(playlist)s/%(chapter_number)s-%(chapter)s/%(autonumber)03d-%(title)s.%(ext)s" http://www.udemy.com/sifirdan-ileri-seviyeye-kotlin-ve-android-kursu/learn/v4/content --verbose

**** Problem:
File "/usr/bin/youtube-dl/youtube_dl/extractor/common.py", line 519, in _request_webpage
return self._downloader.urlopen(url_or_request)
File "/usr/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 2199, in urlopen
return self._opener.open(req, timeout=self._socket_timeout)
File "/usr/lib/python3.6/urllib/request.py", line 532, in open
response = meth(req, response)
File "/usr/lib/python3.6/urllib/request.py", line 642, in http_response
'http', request, response, code, msg, hdrs)
File "/usr/lib/python3.6/urllib/request.py", line 570, in error
return self._call_chain(*args)
File "/usr/lib/python3.6/urllib/request.py", line 504, in _call_chain
result = func(*args)
File "/usr/lib/python3.6/urllib/request.py", line 650, in http_error_default
raise HTTPError(req.full_url, code, msg, hdrs, fp)