Error: 404 Not Found

Sorry, the requested URL 'http://e-onbatteries.com/index.php/catalog/product_compare/add/product/16/uenc/aHR0cDovL2Utb25iYXR0ZXJpZXMuY29tL2luZGV4LnBocC9ob21lLWVuZXJneS1zdG9yYWdlL2RpcmVjdC1yZXBsYWNlbWVudC1ob21lLWVuZXJneS5odG1sP21vZGU9bGlzdA%2C%2C/form_key/DpQ8WPPcnDFHEW9x/' caused an error:

Not found: '/index.php/catalog/product_compare/add/product/16/uenc/aHR0cDovL2Utb25iYXR0ZXJpZXMuY29tL2luZGV4LnBocC9ob21lLWVuZXJneS1zdG9yYWdlL2RpcmVjdC1yZXBsYWNlbWVudC1ob21lLWVuZXJneS5odG1sP21vZGU9bGlzdA,,/form_key/DpQ8WPPcnDFHEW9x/'