Enternal Server Error

Error in class CDbDriver, function SelectRow()

SELECT ecd.* FROM expert_chain_desc as ecd, expert_chain_desc_chains as ecdc WHERE ecd.id = ecdc.chain_desc_id and ecd.consultation_flag IN( 3,5) and ecdc.chain_id = 400329 AND section_id=120 ORDER BY ecd.consultation_flag LIMIT 1 : Got error 28 from storage engine