Receiving "Stream encountered HTTP error: 403" when using Twitter API. What is causing this error and how can I fix it?

I am very new to using the Twitter API and was testing some Python code (below)

from tweepy import OAuthHandler 
from tweepy import Stream

import twitter_credentials

class StdOutListener(Stream):
    def on_data(self, data):
        print(data)
        return True

    def on_error(self, status):
        print(status)

twitter_stream = StdOutListener(
  twitter_credentials.CONSUMER_KEY, twitter_credentials.CONSUMER_KEY_SECERET,
  twitter_credentials.ACCESS_TOKEN, twitter_credentials.ACCESS_TOKEN_SECERET
)
twitter_stream.filter(track=['#bitcoin'])

but whenever I try to run it, it would give this repeating error "Stream encountered HTTP error: 403". I checked the Twitter API response codes and error 403 was listed as the request is forbidden.

Here are some troubleshooting steps I already took:

1. tried new access keys/consumer keys
2. tried to create a new developer account
3. uninstall and reinstall tweepy

None of these worked for me. So what is causing this error and how can I fix it? Thank you.