Fatal Error after 2.7 upgrade

Warning: main() [function.main]: Unable to access ./wp-blog-header.php in /home/zacharyz/public_html/goldfishcake/index.php on line 17

Warning: main(./wp-blog-header.php) [function.main]: failed to open stream: No such file or directory in /home/zacharyz/public_html/goldfishcake/index.php on line 17

Warning: main() [function.main]: Unable to access ./wp-blog-header.php in /home/zacharyz/public_html/goldfishcake/index.php on line 17

Warning: main(./wp-blog-header.php) [function.main]: failed to open stream: No such file or directory in /home/zacharyz/public_html/goldfishcake/index.php on line 17

Warning: main() [function.main]: Unable to access ./wp-blog-header.php in /home/zacharyz/public_html/goldfishcake/index.php on line 17

Warning: main(./wp-blog-header.php) [function.main]: failed to open stream: No such file or directory in /home/zacharyz/public_html/goldfishcake/index.php on line 17

Fatal error: main() [function.require]: Failed opening required './wp-blog-header.php' (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/zacharyz/public_html/goldfishcake/index.php on line 17

You can see it here: https://goldfishcake.com/

Dashboard and admin controls are fine. I tried to reinstall the backup I made before upgrading. Again, dashboard/admin controls were fine but the same fatal error when I tried to view my blog.

Any help would be appreciated. Thank you.