Problem when using new_managed_dataset_creation_helper()

Hi! I'm trying to create a dataset from a notebook using the method "new_managed_dataset_creation_helper()". E.g.:

dataset = builder.create()

Then, when running:

UnicodeDecodeErrorTraceback (most recent call last)
<ipython-input-23-cd2bbeff86b9> in <module>()
----> 1 dataset = builder.create()

/home/s-dataiku/Dataiku_install/dataiku-dss-8.0.4/python/dataikuapi/dss/dataset.pyc in create(self, overwrite)
    829             body = {
    830                 "name": self.dataset_name,
--> 831                 "creationSettings":  self.creation_settings
    832         })
    833         return DSSDataset(self.project.client, self.project.project_key, self.dataset_name)

/home/s-dataiku/Dataiku_install/dataiku-dss-8.0.4/python/dataikuapi/dssclient.pyc in _perform_json(self, method, path, params, body, files, raw_body)
   1011 
   1012     def _perform_json(self, method, path, params=None, body=None,files=None, raw_body=None):
-> 1013         return self._perform_http(method, path,  params=params, body=body, files=files, stream=False, raw_body=raw_body).json()
   1014 
   1015     def _perform_raw(self, method, path, params=None, body=None,files=None, raw_body=None):

/home/s-dataiku/Dataiku_install/dataiku-dss-8.0.4/python/dataikuapi/dssclient.pyc in _perform_http(self, method, path, params, body, stream, files, raw_body)
    991         try:
    992             http_res = self._session.request(
--> 993                     method, "%s/dip/publicapi%s" % (self.host, path),
    994                     params=params, data=body,
    995                     files = files,

UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 21: ordinal not in range(128)

The following error is printed:

import dataiku
client = dataiku.api_client()
project = client.get_project('myprojectname')
builder = project.new_managed_dataset_creation_helper("mydatasetname")
builder.with_store_into("myhdfsconnection", format_option_id="myformat")

I use the same parameters (for the string parameters 'myhdfsconnection' and 'myformat') that I choose when I create a dataset from the Inputs/Outputs Recipe menu.

Thanks!