newbie with models - user-defined function raised exception

hi,
i'm using djangobook to learn django,

when i go to localhost:8000/admin

there's no problem, also no problem with these two:

http://localhost:8000/admin/books/
http://localhost:8000/admin/books/publisher/

but going to:
http://localhost:8000/admin/books/book
gives this error:

DatabaseError at /admin/books/book/

user-defined function raised exception

Request Method:	GET
Request URL:	http://localhost:8000/admin/books/book/
Django Version:	1.5.5
Exception Type:	DatabaseError
Exception Value:	user-defined function raised exception
Exception Location:	/usr/lib/python2.7/site-packages/django/db/backends/sqlite3/base.py in execute, line 362
Python Executable:	/usr/bin/python
Python Version:	2.7.5
Python Path:	['/home/asedsami/djcode/mysite', '/usr/lib64/python27.zip', '/usr/lib64/python2.7', '/usr/lib64/python2.7/plat-linux2', '/usr/lib64/python2.7/lib-tk', '/usr/lib64/python2.7/lib-old', '/usr/lib64/python2.7/lib-dynload', '/usr/lib64/python2.7/site-packages', '/usr/lib64/python2.7/site-packages/gtk-2.0', '/usr/lib/python2.7/site-packages']
Server time:	Wed, 4 Jun 2014 13:33:43 -0500 --------------------------------------------------------------------------------------------------------------------------------------------------------------- Error during template rendering In template /usr/lib/python2.7/site-packages/django/contrib/admin/templates/admin/change_list.html, error at line 73 user-defined function raised exception 63    {% endif %} 64    {% endblock %} 65    {% if cl.formset.errors %} 66    <p class="errornote"> 67    {% blocktrans count cl.formset.errors|length as counter %}Please correct the error below.{% plural %}Please correct the errors below.{% endblocktrans %} 68    </p> 69    {{ cl.formset.non_form_errors }} 70    {% endif %} 71    <div class="module{% if cl.has_filters %} filtered{% endif %}" id="changelist"> 72    {% block search %}{% search_form cl %}{% endblock %} 73    {% block date_hierarchy %}{% date_hierarchy cl %}{% endblock %} 74 75    {% block filters %} 76    {% if cl.has_filters %} 77    <div id="changelist-filter"> 78    <h2>{% trans 'Filter' %}</h2> 79    {% for spec in cl.filter_specs %}{% admin_list_filter cl spec %}{% endfor %} 80    </div> 81    {% endif %} 82    {% endblock %} 83 should i ask this in stackoverflow instead of here? i don't think i never even touched the above file and i don't know what causes this error, so, thank you for you help.

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