$ python2 pwb.py upload.py -keep -noverify -ignorewarn "/…/BSicon hÜST.svg" narrow formations

ERROR: Traceback (most recent call last):
  File "/…/Documents/pywikibot/pywikibot/data/api.py", line 1558, in submit
    body=body, headers=headers)
  File "/…/Documents/pywikibot/pywikibot/tools/__init__.py", line 1105, in wrapper
    return obj(*__args, **__kw)
  File "/…/Documents/pywikibot/pywikibot/comms/http.py", line 279, in request
    r = fetch(baseuri, method, body, headers, **kwargs)
  File "/…/Documents/pywikibot/pywikibot/comms/http.py", line 381, in fetch
    error_handling_callback(request)
  File "/…/Documents/pywikibot/pywikibot/comms/http.py", line 297, in error_handling_callback
    raise request.data
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 884: ordinal not in range(128)