Enternal Server Error

Error in class CDbDriver, function Select()

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '-20,30' at line 19 Q: SELECT DISTINCT(hc.href_id) FROM expert_hrefs hr, expert_href_sections hs, expert_href_chains hc, expert_sections_domains hd, expert_chains t1, expert_chains t2 WHERE 1 AND t1.chain_id=t2.chain_id AND t1.attr_value_id=1248 AND hc.chain_id=t1.chain_id AND hr.info_src_id!=41 AND hr.id=hc.href_id AND hs.id=hr.section_id AND hr.is_show='1' AND hs.id=hd.section_id AND hd.domain_id='1' AND hs.id=74 AND 1 ORDER BY hr.date DESC LIMIT -20,30