I am not able to get the repository for core-plot. What I am doing is that I am typing this in the terminal:

hg clone https://core-plot.googlecode.com/hg/ core-plot

and this is what I get:

Traceback (most recent call last):

File "/usr/local/bin/hg", line 25, in 
mercurial.util.set_binary(fp)

File "/Library/Python/2.5/site-packages/mercurial/demandimport.py", line 75, in __getattribute__
self._load()

File "/Library/Python/2.5/site-packages/mercurial/demandimport.py", line 47, in _load
    mod = _origimport(head, globals, locals)


  File "/Library/Python/2.5/site-packages/mercurial/util.py", line 93, in 
    _encoding = locale.getlocale()[1]

  File "/System/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/locale.py", line 460, in getlocale
    return _parse_localename(localename)

  File "/System/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/locale.py", line 373, in _parse_localename
    raise ValueError, 'unknown locale: %s' % localename

ValueError: unknown locale: UTF-8

I can't seem to get it to install. Please give me guidance on how to install the repository.