グダグダ書いてもしょうがないので簡潔に書きます

#必要なもの

tweepy
MeCab

これを予め入れてください．入れ方はggってください．

#なにか
TwitterAPIのpublic streamで全世界のツイートを取得し，その中から日本語のツイートだけをふるいにかけ、余計な情報を削除した後MeCabに投げ形態素解析するものです．

#! /usr/bin/env python3
# encoding=utf-8
import re
import tweepy
import unicodedata
import MeCab
from datetime import timedelta

CK = ""
CS = ""
AT = ""
AS = ""



class Listener(tweepy.StreamListener):
    def on_status(self, status):
        status.created_at += timedelta(hours=9)

        if is_japanese(status.text):
            tweet = format_text(status.text)
            print(tweet)
            print(MeCab.Tagger("").parse(tweet.encode("utf-8")))


        return True

    def on_error(self, status_code):
        print('Error: ' + str(status_code))
        return True

    def on_timeout(self):
        print('Timeout...')
        return True

def format_text(text):

    text = re.sub(r'https?://[\w/:%#\$&\?\(\)~\.=\+\-…]+', "", text)
    text = re.sub(r'@[\w/:%#\$&\?\(\)~\.=\+\-…]+', "", text)
    text = re.sub(r'&[\w/:%#\$&\?\(\)~\.=\+\-…]+', "", text)
    text = re.sub('お気に入り', "", text)
    text = re.sub('まとめ', "", text)
    text = re.sub(r'[!-~]', "", text)  # 半角記号,数字,英字
    text = re.sub(r'[︰-＠]', "", text)  # 全角記号
    text = re.sub('\n', " ", text)  # 改行文字
    text = re.sub(';', "", text)
    text = re.sub('RT', "", text)
    text = re.sub('\n', " ", text)
    return text

def is_japanese(string):
    for ch in string:
        name = unicodedata.name(ch)
        if ("CJK UNIFIED" in name and ("HIRAGANA" in name or "KATAKANA" in name)) \
                or ("HIRAGANA" in name or "KATAKANA" in name):
            return True
        return False

    def name(ch):
        try:
            return unicodedata.name

        except ValueError:
            return None



auth = tweepy.OAuthHandler(CK, CS)
auth.set_access_token(AT, AS)


listener = Listener()
stream = tweepy.Stream(auth, listener)
stream.sample()#filterにすると条件を付けれる（詳細はggってくだ..）

これを動かしているとたまに

Traceback (most recent call last):
  File "Get_public_tweet.py", line 86, in <module>
    stream.sample()
  File "/Library/Python/2.7/site-packages/tweepy/streaming.py", line 419, in sample
    self._start(async)
  File "/Library/Python/2.7/site-packages/tweepy/streaming.py", line 361, in _start
    self._run()
  File "/Library/Python/2.7/site-packages/tweepy/streaming.py", line 294, in _run
    raise exception
ValueError: no such name

こういうエラーが出てくるけれど原因がわからなくて、わかる人コメント等で教えて欲しいです．