Failed upgrade to .72..warning & fatal error.

Hello, I was alerted to a security hole in wordpress so I’m trying to upgrade to .72. I have followed the instructions provided but run into this error
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Warning: main(../wp-config.php): failed to open stream: No such file or directory in /home2/trinity/public_html/wp-admin/upgrade-071-to-072.php on line 3
Fatal error: main(): Failed opening required ‘../wp-config.php’ (include_path=’.:/usr/share/php:/home2/strata79/public_html/billing:/home2/strata79/public_html/billing/include’) in /home2/trinity/public_html/wp-admin/upgrade-071-to-072.php on line 3
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I’m not really the best at fishing out what is amiss so I would be most greatful is anyone could assist me ??
Thanks,
Trinity