Error | Instrument Bibliometric National

Error

Error message

PDOException: SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '2012' AND pub.classification_id = 8' at line 3: SELECT MIN(col.published_on) AS min_year FROM ibn_person_result_publications p INNER JOIN ibn_result_publications pub ON pub.id=p.result_publication_id INNER JOIN ibn_collections col ON col.id=pub.journal_number_id WHERE col.title = 'Modern Problems of Radio Engineering, Telecommunications and Computer Science - Proceedings of the 11th International Conference, TCSET'2012' AND pub.classification_id = 8; Array ( ) in getDownloadsNumber() (line 1942 of /var/www/sites/idsi/ibn2014/trunk/sites/all/modules/Graph_Stacked/Graph_Stacked.module).
The website encountered an unexpected error. Please try again later.