ERROR: General Exception

Undefined constant PDO::MYSQL_ATTR_INIT_COMMAND

/home/mancwebdesign/public_html/includes/func.database.php

#0 /home/mancwebdesign/public_html/includes/func.database.php(5): ConnectToDB() #1 /home/mancwebdesign/public_html/index.php(48): GetConnectionDB() #2 {main}