DB Error: selectSingle query failed

SELECT DISTINCT file_attachments.*, channels.name AS channel, files.name, files.ext, files.title_cs AS title, files.type_id, files.size, files.visible, files.private FROM file_attachments LEFT JOIN files ON files.id = file_attachments.file_id LEFT JOIN channels ON channels.id = file_attachments.channel_id LEFT JOIN file_category_relations ON files.id = file_category_relations.file_id WHERE channels.name = 'node_versions' AND object_id = '156' AND main = 1

Got error 28 from storage engine