Database errors on PgSQL

The lastes module throws up these errors on PostgreSQL.

    * warning: pg_query() [function.pg-query]: Query failed: ERROR: column "blocks.weight" must appear in the GROUP BY clause or be used in an aggregate function in /home/.../includes/database.pgsql.inc on line 139.
    * user warning: ERROR: column "blocks.weight" must appear in the GROUP BY clause or be used in an aggregate function query: SELECT module, delta, weight, region, status FROM blocks GROUP BY module, delta ORDER BY module, delta, weight, region, status in /home/.../context/context_ui/context_ui.admin.inc on line 964.
    * warning: Invalid argument supplied for foreach() in /home/.../context/context_ui/context_ui.admin.inc on line 190.