Unicode error generating PDF

[Matt Good]

Description copied from ​t:#4575

On web-page ​http://dev.edgcm.columbia.edu/wiki/EdGCM/UsageNotes

attempting to select the "PDF" button at the bottom, just below "Download in ohter formats:" geterates the following error:

Python Traceback

Traceback (most recent call last):
  File "/sw/lib/python2.4/site-packages/trac/web/main.py", line 387, in dispatch_request
    dispatcher.dispatch(req)
  File "/sw/lib/python2.4/site-packages/trac/web/main.py", line 237, in dispatch
    resp = chosen_handler.process_request(req)
  File "/sw/lib/python2.4/site-packages/trac/wiki/web_ui.py", line 134, in process_request
    page.text, format, page.name)
  File "/sw/lib/python2.4/site-packages/trac/mimeview/api.py", line 604, in send_converted
    content, selector)
  File "/sw/lib/python2.4/site-packages/trac/mimeview/api.py", line 384, in convert_content
    output = converter.convert_content(req, mimetype, content, ck)
  File "build/bdist.darwin-8.8.0-Power_Macintosh/egg/pagetopdf/pagetopdf.py", line 20, in convert_content
  File "/sw/lib/python2.4/encodings/iso8859_15.py", line 18, in encode
    return codecs.charmap_encode(input,errors,encoding_map)
UnicodeEncodeError: 'charmap' codec can't encode character u'\u2019' in position 1764: character maps to <undefined>

[Alec Thomas]

Duplicate of #841.

[mankoff]

The page that opened this ticket does not appear to be a dupe of #841, which discusses accents. Why is this a dupe? And what can I do to avoid this bug?