kraken: Bad Credentials

Hello, I tried to install kraken using pip3 and everything went fine, but I cannot use it. As soon as I try to get default, I have the following error message

$ kraken get default
Retrieving model	⣾Traceback (most recent call last):
  File "/usr/local/bin/kraken", line 11, in <module>
    sys.exit(cli())
  File "/usr/local/lib/python3.6/site-packages/click/core.py", line 722, in __call__
    return self.main(*args, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/click/core.py", line 697, in main
    rv = self.invoke(ctx)
  File "/usr/local/lib/python3.6/site-packages/click/core.py", line 1092, in invoke
    rv.append(sub_ctx.command.invoke(sub_ctx))
  File "/usr/local/lib/python3.6/site-packages/click/core.py", line 895, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/usr/local/lib/python3.6/site-packages/click/core.py", line 535, in invoke
    return callback(*args, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/click/decorators.py", line 17, in new_func
    return f(get_current_context(), *args, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/kraken/kraken.py", line 346, in get
    partial(spin, 'Retrieving model'))
  File "/usr/local/lib/python3.6/site-packages/kraken/repo.py", line 46, in get_model
    raise KrakenRepoException(resp['message'])
kraken.lib.exceptions.KrakenRepoException: Bad credentials

I did remove kraken and tried with a pip2 install, but the result remains the same :

$ kraken get default
Retrieving model	⣾Traceback (most recent call last):
  File "/usr/local/bin/kraken", line 11, in <module>
    sys.exit(cli())
  File "/usr/local/lib/python2.7/site-packages/click/core.py", line 722, in __call__
    return self.main(*args, **kwargs)
  File "/usr/local/lib/python2.7/site-packages/click/core.py", line 697, in main
    rv = self.invoke(ctx)
  File "/usr/local/lib/python2.7/site-packages/click/core.py", line 1092, in invoke
    rv.append(sub_ctx.command.invoke(sub_ctx))
  File "/usr/local/lib/python2.7/site-packages/click/core.py", line 895, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/usr/local/lib/python2.7/site-packages/click/core.py", line 535, in invoke
    return callback(*args, **kwargs)
  File "/usr/local/lib/python2.7/site-packages/click/decorators.py", line 17, in new_func
    return f(get_current_context(), *args, **kwargs)
  File "/usr/local/lib/python2.7/site-packages/kraken/kraken.py", line 346, in get
    partial(spin, 'Retrieving model'))
  File "/usr/local/lib/python2.7/site-packages/kraken/repo.py", line 46, in get_model
    raise KrakenRepoException(resp['message'])
kraken.lib.exceptions.KrakenRepoException: Bad credentials

What did I miss ? (I use a macOS 10.12.6, python 2.7 or 3.6)