requests.exceptions.ChunkedEncodingError: ('Connection broken: IncompleteRead(0 bytes read, 512 more expected)', IncompleteRead – Twitter API

I wanted to write a program to fetch tweets from Twitter and then do sentiment analysis. I wrote the following code and got the error even after importing all the necessary libraries. I’m relatively new to data science, so please help me.
I could not understand the reason for this error:

class TwitterClient(object):


def __init__(self):

    # keys and tokens from the Twitter Dev Console
    consumer_key = 'XXXXXXXXX'
    consumer_secret = 'XXXXXXXXX'
    access_token = 'XXXXXXXXX'
    access_token_secret = 'XXXXXXXXX'
    api = Api(consumer_key, consumer_secret, access_token, access_token_secret)

    def preprocess(tweet, ascii=True, ignore_rt_char=True, ignore_url=True, ignore_mention=True, ignore_hashtag=True,letter_only=True, remove_stopwords=True, min_tweet_len=3):
        sword = stopwords.words('english')

        if ascii:  # maybe remove lines with ANY non-ascii character
            for c in tweet:
                if not (0 < ord(c) < 127):
                    return ''

        tokens = tweet.lower().split()  # to lower, split
        res = []

        for token in tokens:
            if remove_stopwords and token in sword: # ignore stopword
                continue
            if ignore_rt_char and token == 'rt': # ignore 'retweet' symbol
                continue
            if ignore_url and token.startswith('https:'): # ignore url
                continue
            if ignore_mention and token.startswith('@'): # ignore mentions
                continue
            if ignore_hashtag and token.startswith('#'): # ignore hashtags
                continue
            if letter_only: # ignore digits
                if not token.isalpha():
                    continue
            elif token.isdigit(): # otherwise unify digits
                token = '<num>'

            res += token, # append token

        if min_tweet_len and len(res) < min_tweet_len: # ignore tweets few than n tokens
            return ''
        else:
            return ' '.join(res)

    for line in api.GetStreamSample():            
        if 'text' in line and line['lang'] == u'en': # step 1
            text = line['text'].encode('utf-8').replace('n', ' ') # step 2
            p_t = preprocess(text)

    # attempt authentication
    try:
        # create OAuthHandler object
        self.auth = OAuthHandler(consumer_key, consumer_secret)
        # set access token and secret
        self.auth.set_access_token(access_token, access_token_secret)
        # create tweepy API object to fetch tweets
        self.api = tweepy.API(self.auth)
    except:
        print("Error: Authentication Failed")

Assume all the necessary libraries are imported. The error is on line 69.

for line in api.GetStreamSample():            
    if 'text' in line and line['lang'] == u'en': # step 1
        text = line['text'].encode('utf-8').replace('n', ' ') # step 2
        p_t = preprocess(text)

I tried checking on the internet the reason for the error but could not get any solution.

Error was:

requests.exceptions.ChunkedEncodingError: ('Connection broken: IncompleteRead(0 bytes read, 512 more expected)', IncompleteRead(0 bytes read, 512 more expected))

I’m using Python 2.7 and requests version 2.14, the latest one.