My b2evolution Version: Not Entered

assomeone who doesn't really have a clue about this stuff i'm really lost. help please!

the error i get when installing is:

Fatal error: Failed opening required '/domains/603/1568/html/install/../conf/_config.php' (include_path='.:/usr/share/pear') in /domains/603/1568/html/install/index.php on line 19