Snapshot errors – more

I am now seeing these errors… what do these mean?

2012-10-30 22:49:58: Notice: errno:8 Undefined variable: db_name /home/mysitename/public_html/wp-content/plugins/snapshot/lib/snapshot_utilities.php on line 90

2012-10-30 22:49:58: Notice: errno:8 Undefined variable: wpdb_prefix /home/mysitename/public_html/wp-content/plugins/snapshot/lib/snapshot_utilities.php on line 91