runtime error

nom/qanom_end_to_end_pipeline.py", line 3, in <module> from qanom.nominalization_detector import NominalizationDetector File "/home/user/.local/lib/python3.8/site-packages/qanom/nominalization_detector.py", line 9, in <module> from qanom.candidate_extraction.candidate_extraction import get_candidate_nouns_from_pos_tagged_sentences, pos_tag_sentence File "/home/user/.local/lib/python3.8/site-packages/qanom/candidate_extraction/candidate_extraction.py", line 48, in <module> if (not nltk_downloader.is_installed(tagger_package)): File "/home/user/.local/lib/python3.8/site-packages/nltk/downloader.py", line 844, in is_installed return self.status(info_or_id, download_dir) == self.INSTALLED File "/home/user/.local/lib/python3.8/site-packages/nltk/downloader.py", line 860, in status info = self._info_or_id(info_or_id) File "/home/user/.local/lib/python3.8/site-packages/nltk/downloader.py", line 603, in _info_or_id return self.info(info_or_id) File "/home/user/.local/lib/python3.8/site-packages/nltk/downloader.py", line 1009, in info self._update_index() File "/home/user/.local/lib/python3.8/site-packages/nltk/downloader.py", line 952, in _update_index ElementTree.parse(urlopen(self._url)).getroot() File "/usr/local/lib/python3.8/urllib/request.py", line 222, in urlopen return opener.open(url, data, timeout) File "/usr/local/lib/python3.8/urllib/request.py", line 525, in open response = self._open(req, data) File "/usr/local/lib/python3.8/urllib/request.py", line 542, in _open result = self._call_chain(self.handle_open, protocol, protocol + File "/usr/local/lib/python3.8/urllib/request.py", line 502, in _call_chain result = func(*args) File "/usr/local/lib/python3.8/urllib/request.py", line 1397, in https_open return self.do_open(http.client.HTTPSConnection, req, File "/usr/local/lib/python3.8/urllib/request.py", line 1357, in do_open raise URLError(err) urllib.error.URLError: <urlopen error [Errno -3] Temporary failure in name resolution>

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