Error: 404 Not Found

Sorry, the requested URL 'http://e-onbatteries.com/catalog/product_compare/add/product/19/uenc/aHR0cDovL2Utb25iYXR0ZXJpZXMuY29tL2luZGV4LnBocC9yZWNyZWF0aW9uYWwuaHRtbD9tb2RlPWxpc3Q%2C/form_key/766Q7F1qduUeUmeV/' caused an error:

Not found: '/catalog/product_compare/add/product/19/uenc/aHR0cDovL2Utb25iYXR0ZXJpZXMuY29tL2luZGV4LnBocC9yZWNyZWF0aW9uYWwuaHRtbD9tb2RlPWxpc3Q,/form_key/766Q7F1qduUeUmeV/'