Your current theme apparently had some issues with the update.
Do you have acces to your website FTP, or some sorts of file manager from your web hosting service?
Using an FTP client such as FileZilla, or your host provided file management tool(s), rename the folder /wp-content/themes/platinumicious/ to /wp-content/themes/old-platinumicious/. Make sure an unedited default theme is in place first. Once the current theme folder is renamed, WP will switch to default theme. Run site and see if that fixed it. If so, update theme (to work with 3.9.1) or use another that does.