エラーが発生しました。

close Can't connect to data source '' because I can't work out what driver to use (it doesn't seem to contain a 'dbi:driver:' prefix and the DBI_DRIVER env var is not set) at /home/users/2/chicappa.jp-fby/web/cgi-bin/mt/extlib/Data/ObjectDriver/Driver/DBI.pm line 59. at /home/users/2/chicappa.jp-fby/web/cgi-bin/mt/extlib/Data/ObjectDriver/Driver/BaseCache.pm line 320.