using rst2pdf 0.11

i run rst2pdf on a rst file
it gives me the error:
Traceback (most recent call last):
  File "/usr/bin/rst2pdf", line 8, in <module>
    load_entry_point('rst2pdf==0.11', 'console_scripts', 'rst2pdf')()
  File "/usr/lib/python2.6/site-packages/rst2pdf/createpdf.py", line 1652, 
in main
    compressed=options.compressed)
  File "/usr/lib/python2.6/site-packages/rst2pdf/createpdf.py", line 1271, 
in createPdf
    elements = self.gen_elements(doctree, 0)
  File "/usr/lib/python2.6/site-packages/rst2pdf/createpdf.py", line 574, 
in gen_elements
    node.elements = self.gather_elements(node, depth, style=style)
  File "/usr/lib/python2.6/site-packages/rst2pdf/createpdf.py", line 1150, 
in gather_elements
    r.extend(self.gen_elements(n, depth, style=style))
  File "/usr/lib/python2.6/site-packages/rst2pdf/createpdf.py", line 849, 
in gen_elements
    node.elements = self.gather_elements(node, depth+1)
  File "/usr/lib/python2.6/site-packages/rst2pdf/createpdf.py", line 1150, 
in gather_elements
    r.extend(self.gen_elements(n, depth, style=style))
  File "/usr/lib/python2.6/site-packages/rst2pdf/createpdf.py", line 1104, 
in gen_elements
    node.elements = parseRaw(str(node.astext()))
UnicodeEncodeError: 'ascii' codec can't encode character u'\xb0' in 
position 59: ordinal not in range(128)

by printing the node in gen_elements, i was able to find that, this cause 
the problem
<raw format="html" xml:space="preserve"><a 
href="javascript:showAndHide('hide')">Carte du circuit n°8</a>
<span id="hide" style="display:none"><a 
href="img/circuit08_vdb_zoom.jpg"><img alt="Circuit n°8" 
src="img/circuit08_vdb.jpg" /></a></span></raw>

° character seems to be the cause of the problem
so obviously, it is an rst meant to be converted to html. with raw portion 
in html. and it includes some non-ascii character. the file is in utf8

may be that's reasonnable than rst2pdf through such an error ?

however i fix it temporaly by changing 1103 line of createpdf.py from 
node.elements = parseRaw(str(node.astext()))
to
node.elements = parseRaw(node.astext())

???