PHP error happened

Technical information
Error type256
Error descriptionTable 'ohset13_dbfind._roster' doesn't exist
URLwww.ohset.com/info/board_list.php?
Error file/home/ohset13/public_html/info/include/dbconnection.php
Error line26
SQL queryselect `off_id`, `name`, `office`, `committees`, `email`, `phone`, `fax`, `cell`, `address`, `login`, `password`, `level`, `district`, `order`, `districtoff`, `districtorder` From `_roster` where (level = "board") ORDER BY `order` ASC