URGENT – Please help

Hello, I need urgent help if possible. This is the error I am getting:

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

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

Fatal error: require() [function.require]: Failed opening required ‘./wordpress/wp-blog-header.php’ (include_path=’.:/usr/lib/php:/usr/local/lib/php’) in /home/lovecore/public_html/index.php on line 17

I changed my blog URL address in “General Settings” and the error showed up. Is there anyone here who can fix this please?

Please help. I’m happy to pay for your time.

Please email: laura (at) lovecoredesigns.com

Thank you