400 Client Error: Bad Request for url

Traceback (most recent call last):
  File "/Users/me/dev/merge/.venv/lib/python3.7/site-packages/bitlyshortener/shortener.py", line 132, in _long_url_to_int_id
    response.raise_for_status()
  File "/Users/me/dev/merge/.venv/lib/python3.7/site-packages/requests/models.py", line 940, in raise_for_status
    raise HTTPError(http_error_msg, response=self)
requests.exceptions.HTTPError: 400 Client Error: Bad Request for url: https://api-ssl.bitly.com/v4/shorten

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/me/dev/merge/.venv/lib/python3.7/site-packages/flask/app.py", line 2309, in __call__
    return self.wsgi_app(environ, start_response)
  File "/Users/me/dev/merge/.venv/lib/python3.7/site-packages/flask/app.py", line 2295, in wsgi_app
    response = self.handle_exception(e)
  File "/Users/me/dev/merge/.venv/lib/python3.7/site-packages/flask/app.py", line 1741, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "/Users/me/dev/merge/.venv/lib/python3.7/site-packages/flask/_compat.py", line 35, in reraise
    raise value
  File "/Users/me/dev/merge/.venv/lib/python3.7/site-packages/flask/app.py", line 2292, in wsgi_app
    response = self.full_dispatch_request()
  File "/Users/me/dev/merge/.venv/lib/python3.7/site-packages/flask/app.py", line 1815, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/Users/me/dev/merge/.venv/lib/python3.7/site-packages/flask/app.py", line 1718, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/Users/me/dev/merge/.venv/lib/python3.7/site-packages/flask/_compat.py", line 35, in reraise
    raise value
  File "/Users/me/dev/merge/.venv/lib/python3.7/site-packages/flask/app.py", line 1813, in full_dispatch_request
    rv = self.dispatch_request()
  File "/Users/me/dev/merge/.venv/lib/python3.7/site-packages/flask/app.py", line 1799, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/Users/me/dev/merge/.venv/lib/python3.7/site-packages/flask_login/utils.py", line 272, in decorated_view
    return func(*args, **kwargs)
  File "/Users/me/dev/merge/webapp/account/views.py", line 54, in account_createtable
    short_url = shortener.shorten_urls(new_url)
  File "/Users/me/dev/merge/.venv/lib/python3.7/site-packages/bitlyshortener/shortener.py", line 191, in shorten_urls
    short_urls = list(mapper(self._shorten_url, long_urls))
  File "/Users/me/.pyenv/versions/3.7.1/lib/python3.7/concurrent/futures/_base.py", line 586, in result_iterator
    yield fs.pop().result()
  File "/Users/me/.pyenv/versions/3.7.1/lib/python3.7/concurrent/futures/_base.py", line 432, in result
    return self.__get_result()
  File "/Users/me/.pyenv/versions/3.7.1/lib/python3.7/concurrent/futures/_base.py", line 384, in __get_result
    raise self._exception
  File "/Users/me/.pyenv/versions/3.7.1/lib/python3.7/concurrent/futures/thread.py", line 57, in run
    result = self.fn(*self.args, **self.kwargs)
  File "/Users/me/dev/merge/.venv/lib/python3.7/site-packages/bitlyshortener/shortener.py", line 162, in _shorten_url
    url_id = self._long_url_to_int_id(long_url)
  File "/Users/me/dev/merge/.venv/lib/python3.7/site-packages/bitlyshortener/shortener.py", line 151, in _long_url_to_int_id
    raise exc.RequestError(msg) from None
bitlyshortener.exc.RequestError: The response status code is 400 and so the request will not be reattempted. The error is: HTTPError: 400 Client Error: Bad Request for url: https://api-ssl.bitly.com/v4/shorten