Warning main DB php failed to open stream No such file or directory in

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Warning: main(DB.php): failed to open stream: No such file or directory in /export/home/ivdesign/htdocs/pages/visualization/startup.php on line 64
Fatal error: main(): Failed opening required 'DB.php' (include_path='./:/export/home/ivdesign/htdocs/inc:/export/home/ivdesign/htdocs/inc/classes:/export/home/ivdesign/htdocs/inc/classes/pear:/export/home/ivdesign/htdocs/inc/classes/pear/DB:/export/home/ivdesign/htdocs/js/ktml/ktml2') in /export/home/ivdesign/htdocs/pages/visualization/startup.php on line 64