Coupon theme 8.8 generate error log for mysql query SELECT SQL_CALC_FOUND_ROWS

I have installed coupon theme 8.8 and checked error log file in root directory. It is generating error on each page visit. Error in query like this:
WordPress database error Column ‘post_date’ in order clause is ambiguous for query SELECT SQL_CALC_FOUND_ROWS wp_posts.ID,
wp_posts.post_title,
wp_posts.guid AS plink,
pm0.meta_value AS lat,
pm0.meta_key AS lat_key,
pm1.meta_value AS log,
pm1.meta_key AS log_key,
pm2.meta_value AS pic, ……………..
full error in attached file

I unable to fix it.

Please suggest me how we can fix it.

Thanks
Navneet