invalid continuation byte

With a .ged file exported from geneanet, I get an encoding problem error:

21         input = input[3:]
     22         prefix = 3
---> 23     (output, consumed) = codecs.utf_8_decode(input, errors, True)
     24     return (output, consumed+prefix)
     25 

UnicodeDecodeError: 'utf-8' codec can't decode byte 0xe2 in position 20: invalid continuation byte
