KeyError at /questions/

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Upgraded from 07.43 to 0.7.48 manage.py syncdb manage.py migrate askbot 0160

manager runserver ip:port

i have this :

KeyError at /questions/
u'common'
Request Method: GET
Request URL:    http://xxxx.com:443/questions/
Django Version: 1.4.3
Exception Type: KeyError
Exception Value:    
u'common'
Exception Location: /opt/SITE-PROJECT/askbot/skins/loaders.py in get_skin, line 84
Python Executable:  /usr/bin/python
Python Version: 2.6.6

How to solve this?