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Look at your .htaccess file in your public_html folder for your WordPress installation. It seems that when with GoDaddy hosted on the windows package, you need the following inheritance set for rewrite in your .htaccess file: RewriteOptions inherit RewriteEngine on That solved my problem on index.php.
Whoever wrote your theme didn't bother to verify the existence of array keys before using them. The error is happening because the key album_tracks_metabox_nonce doesn't exist in the $_POST array. The line likely should be: if ( !isset($_POST['album_tracks_metabox_nonce']) || !wp_verify_nonce($_POST['album_tracks_metabox_nonce'], ...
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