Encoding error creating map

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Error creating map with labels, classification by attribute "nombre"
layer: amb_amenazas

Traceback (most recent call last):
  File "C:/Users/juan.mendez/.qgis2/python/plugins\QgisCartoDB\dialogs\CreateViz.py", line 134, in cbGetLayers
    cartoCSS = self.convert2cartoCSS(layer)
  File "C:/Users/juan.mendez/.qgis2/python/plugins\QgisCartoDB\dialogs\CreateViz.py", line 215, in convert2cartoCSS
    value = '"' + str(cat.value()) + '"'
UnicodeEncodeError: 'ascii' codec can't encode character u'\xd3' in position 8: ordinal not in range(128)


Versión de Python:
2.7.5 (default, May 15 2013, 22:44:16) [MSC v.1500 64 bit (AMD64)]


Versión de QGIS:
2.8.2-Wien Wien, 1b929ef

Ruta de Python: ['C:/PROGRA~1/QGISWI~1/apps/qgis/./python/plugins\\processing', 'C:/PROGRA~1/QGISWI~1/apps/qgis/./python', u'C:/Users/juan.mendez/.qgis2/python', u'C:/Users/juan.mendez/.qgis2/python/plugins', 'C:/PROGRA~1/QGISWI~1/apps/qgis/./python/plugins', 'C:\\PROGRA~1\\QGISWI~1\\apps\\Python27\\lib\\site-packages\\matplotlib-1.3.1-py2.7-win-amd64.egg', 'C:\\PROGRA~1\\QGISWI~1\\apps\\Python27\\lib\\site-packages\\nose-1.3.3-py2.7.egg', 'C:\\PROGRA~1\\QGISWI~1\\apps\\Python27\\lib\\site-packages\\tornado-4.0.1-py2.7-win-amd64.egg', 'C:\\PROGRA~1\\QGISWI~1\\apps\\Python27\\lib\\site-packages\\backports.ssl_match_hostname-3.4.0.2-py2.7.egg', 'C:\\PROGRA~1\\QGISWI~1\\apps\\Python27\\lib\\site-packages\\certifi-14.05.14-py2.7.egg', 'C:\\PROGRA~1\\QGISWI~1\\bin\\python27.zip', 'C:\\PROGRA~1\\QGISWI~1\\apps\\Python27\\DLLs', 'C:\\PROGRA~1\\QGISWI~1\\apps\\Python27\\lib', 'C:\\PROGRA~1\\QGISWI~1\\apps\\Python27\\lib\\plat-win', 'C:\\PROGRA~1\\QGISWI~1\\apps\\Python27\\lib\\lib-tk', 'C:\\PROGRA~1\\QGISWI~1\\bin', 'C:\\PROGRA~1\\QGISWI~1\\apps\\Python27', 'C:\\PROGRA~1\\QGISWI~1\\apps\\Python27\\lib\\site-packages', 'C:\\PROGRA~1\\QGISWI~1\\apps\\Python27\\lib\\site-packages\\PIL', 'C:\\PROGRA~1\\QGISWI~1\\apps\\Python27\\lib\\site-packages\\jinja2-2.7.2-py2.7.egg', 'C:\\PROGRA~1\\QGISWI~1\\apps\\Python27\\lib\\site-packages\\markupsafe-0.23-py2.7-win-amd64.egg', 'C:\\PROGRA~1\\QGISWI~1\\apps\\Python27\\lib\\site-packages\\pytz-2012j-py2.7.egg', 'C:\\PROGRA~1\\QGISWI~1\\apps\\Python27\\lib\\site-packages\\win32', 'C:\\PROGRA~1\\QGISWI~1\\apps\\Python27\\lib\\site-packages\\win32\\lib', 'C:\\PROGRA~1\\QGISWI~1\\apps\\Python27\\lib\\site-packages\\Pythonwin', 'C:\\PROGRA~1\\QGISWI~1\\apps\\Python27\\lib\\site-packages\\Shapely-1.2.18-py2.7-win-amd64.egg', 'C:\\PROGRA~1\\QGISWI~1\\apps\\Python27\\lib\\site-packages\\six-1.3.0-py2.7.egg', 'C:\\PROGRA~1\\QGISWI~1\\apps\\Python27\\lib\\site-packages\\wx-2.8-msw-unicode', 'C:\\PROGRA~1\\QGISWI~1\\apps\\Python27\\lib\\site-packages\\xlrd-0.9.2-py2.7.egg', 'C:\\PROGRA~1\\QGISWI~1\\apps\\Python27\\lib\\site-packages\\xlwt-0.7.5-py2.7.egg', u'C:/Users/juan.mendez/.qgis2//python', '.', 'C:\\PROGRA~1\\QGISWI~1\\apps\\qgis\\python\\plugins\\fTools\\tools']

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Error with encoding, It must be sent in UTF8