 max key length is 1000 bytes

hi.. i try agro and in manage.py syncdb i find eror like this

 File "/var/lib/python-support/python2.5/MySQLdb/connections.py", line 35, in defaulterrorhandler
    raise errorclass, errorvalue
_mysql_exceptions.OperationalError: (1071, 'Specified key was too long; max key length is 1000 bytes'

regards
