Error: 404 Not Found

Sorry, the requested URL 'http://e-onbatteries.com/index.php/catalog/product_compare/add/product/25/uenc/aHR0cDovL2Utb25iYXR0ZXJpZXMuY29tL2luZGV4LnBocC9yZWNyZWF0aW9uYWwvMjR2LzI0di1tYXJpbmUvMjR2LTUwYWgtYmx1ZXRvb3RoLWVuYWJsZWQtbGlmZXBvNC1zbWFydC1iYXR0ZXJ5Lmh0bWw%2C/form_key/1oLuygBBkQoy9NHh/' caused an error:

Not found: '/index.php/catalog/product_compare/add/product/25/uenc/aHR0cDovL2Utb25iYXR0ZXJpZXMuY29tL2luZGV4LnBocC9yZWNyZWF0aW9uYWwvMjR2LzI0di1tYXJpbmUvMjR2LTUwYWgtYmx1ZXRvb3RoLWVuYWJsZWQtbGlmZXBvNC1zbWFydC1iYXR0ZXJ5Lmh0bWw,/form_key/1oLuygBBkQoy9NHh/'