Not all named parameters have been set under certain conditions.

I have the following query in my Hibernate ie createSQLQuery

SELECT to_char(dd, 'Mon YYYY') FROM generate_series('2013-01-01'::date, date_trunc('month', now()), '1 month') as dd 

which produces output on startup in PostgreSQL as

• "January 2013" "February 2013"., "Feb 2014"

However, using it via createSQLQuery, as shown below, it throws " org.hibernate.QueryException: not all named parameters are set: [: date] "

Please note that the date was used as ' 2013-01-01' :: date

try{
            session = HibernateSessionFactory.getSession(); 
            tx = session.beginTransaction();

            Query query = session.createSQLQuery("SELECT to_char(dd, 'Mon YYYY') FROM generate_series('2013-01-01'::date, date_trunc('month', now()), '1 month') as dd");
            monthList = new ArrayList<String>();            
            monthList = query.list();
            tx.commit();
        }

Please suggest