django內置評論模型管理導致UTF-8錯誤

我從django教程中添加了standart評論模型（'django.contrib.comments'和'django.contrib.sites'），它工作正常。但是，當我嘗試顯示評論管理評論列表，它會導致錯誤：django內置評論模型管理導致UTF-8錯誤

UnicodeDecodeError at /admin/comments/comment/ 
'utf8' codec can't decode byte 0xc2 in position 80: invalid continuation byte 
Request Method: GET 
Request URL: http://127.0.0.1:8000/admin/comments/comment/ 
Django Version: 1.6.4 
Exception Type: UnicodeDecodeError 
Exception Value:  
'utf8' codec can't decode byte 0xc2 in position 80: invalid continuation byte 
Exception Location: C:\Python27\lib\encodings\utf_8.py in decode, line 16 
Python Executable: C:\Python27\python.exe 
Python Version: 2.7.6 

Unicode error hint 

The string that could not be encoded/decoded was: ONE '������ 
Error during template rendering 

In template C:\Users\Harkonnen\PycharmProjects\alpha\grappelli\templates\admin\change_list.html, error at line 207 
utf8 
205   <!-- DATE HIERARCHY --> 
206   {% block date_hierarchy %} 
207    {% if cl.date_hierarchy %}{% date_hierarchy cl %}{% endif %} 
208   {% endblock %}

是否有可能解決，而不編輯非標準的Django或grappeli模型這個錯誤？

UPD：withut格拉佩利同樣的錯誤=（

In template C:\Python27\lib\site-packages\django\contrib\admin\templates\admin\change_list.html, error at line 73 

73  {% block date_hierarchy %}{% date_hierarchy cl %}{% endblock %}

來源

2014-05-12 Harkonnen