Could not execute query

[SET NAMES 'utf8' COLLATE 'utf8_general_ci';] - No such file or directory -
- error in file include/include_db.php on line # 80 : executeQuery
- error in file include/include_db.php on line # 174 : openConnection
- error in file include/include_db.php on line # 190 : executeQuery
- error in file include/include_db.php on line # 262 : executeQuery
- error in file products.php on line # 863 : preparedQuery
- error in file _rewrite.php on line # 803 : require