runtime error

ndor.urllib3.connection.HTTPSConnection object at 0x7fe25968d3d0>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution')': /simple/nltk/ WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x7fe25968d700>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution')': /simple/nltk/ WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x7fe25968d8e0>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution')': /simple/nltk/ WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x7fe25968da90>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution')': /simple/nltk/ WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x7fe25968dc10>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution')': /simple/nltk/ ERROR: Could not find a version that satisfies the requirement nltk (from versions: none) ERROR: No matching distribution found for nltk WARNING: There was an error checking the latest version of pip. /usr/local/bin/python: Error while finding module specification for 'nltk.downloader' (ModuleNotFoundError: No module named 'nltk') Traceback (most recent call last): File "app.py", line 9, in <module> from question_generation.pipelines import pipeline File "/home/user/app/question_generation/pipelines.py", line 5, in <module> from nltk import sent_tokenize ModuleNotFoundError: No module named 'nltk'

Container logs: