SQL query problem

Dear Colleagues,

I have been able to run the following query successfully on postgresl-
6.3.2 but unable to run the same in Postgresql-6.5.2. can anyone tell 
me
the error and why it is running fine in 6.3.2 but not in 6.5.2.:

select 
a.offer_id,a.comp_id,prod_name,date(offer_date),ti
me(offer_date),
clicks,bidcount,ship_price, 
ship_price_currency,ship_currency_unit,
date_part('day',age(expiry_date,'now')),
date_part('hour',age(expiry_date,'now')),
date_part('min',age(expiry_date,'now')), 
offer_type from offer a, product
b,enquiry c where expiry_date>='now' and 
b.prod_id = a.prod_id and
a.offer_id=c.offer_orig and bidcount<>0 and 
offer_type='sell' and
upper(transaction_complete)='N' group by 
a.offer_id order by prod_name;


Thanks in advance for the help.

With Best Regards,
Vicky

Alpha Group (Hong Kong) Ltd.
15/B Wah Kit Commercial Centre
300-302, Des Voeux Road Central
Sheung Wan
Hong Kong
Phone : (852) 28507827
FAX   : (852) 28504229
Email : vikrant@alphahkg.com