I have downloaded all the packages of NLTK with the command of `nltk.download()`.
but the thing is that when I try to import `TweetTokenizer` I get the error.

```
tokenizer = TweetTokenizer(preserve_case=False, strip_handles=True, reduce_len=True)
tweet_tokens = tokenizer.tokenize(tweet2)

```

Error:

```
NameError: name 'TweetTokenizer' is not defined

```