'ascii' codec can't decode byte 0xc3 in position 53839: ordinal not in range(128)


Traceback (most recent call last):
  File "/mnt/hd/web/1bpm.net/ml.csound/app/handler.py", line 386, in <module>
    handle()
  File "/mnt/hd/web/1bpm.net/ml.csound/app/handler.py", line 379, in handle
    return Attachment(mailing_list).render({"ident": parts[2]})
  File "/mnt/hd/web/1bpm.net/ml.csound/app/handler.py", line 296, in render
    sys.stdout.write(parsed.attachment.encode("utf-8"))
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 53839: ordinal not in range(128)