Planet venus decode error

[James Holderness]

I've just started experimenting with Planet Venus on my Windows XP system 
and I've encountered a problem. I managed to get it working with one feed so 
I think the basic system is working. However, when I tried to add my own 
feed I got this error:

ERROR:planet.runner:Error processing http://www.xn--8ws00zhy3a.com/feed
ERROR:planet.runner:UnicodeDecodeError: 'ascii' codec can't decode byte 0xe8 
in position 11: ordinal not in range(128)
ERROR:planet.runner:  File "C:\Program Files\venus\planet\spider.py", line 
433, in spiderPlanet
    writeCache(uri, feed_info, data)
ERROR:planet.runner:  File "C:\Program Files\venus\planet\spider.py", line 
205, in writeCache
    output = xdoc.toxml().encode('utf-8')
ERROR:planet.runner:  File "C:\Python25\lib\xml\dom\minidom.py", line 45, in 
toxml
    return self.toprettyxml("", "", encoding)
ERROR:planet.runner:  File "C:\Python25\lib\xml\dom\minidom.py", line 60, in 
toprettyxml
    return writer.getvalue()
ERROR:planet.runner:  File "C:\Python25\lib\StringIO.py", line 270, in 
getvalue
    self.buf += ''.join(self.buflist)

Does that mean there is an error in the feed, or is the problem somewhere 
else? According to the feed validator the feed is valid, so I didn't think 
the feed was the problem.

Regards
James