Error: 404 Not Found

Sorry, the requested URL 'http://e-onbatteries.com/catalog/product_compare/add/product/18/uenc/aHR0cDovL2Utb25iYXR0ZXJpZXMuY29tL2luZGV4LnBocC8xMnYtNTBhaC1ibHVldG9vdGgtZW5hYmxlZC1saWZlcG80LXNtYXJ0LWJhdHRlcnkuaHRtbA%2C%2C/form_key/Eys5yMCszr27UPFV/' caused an error:

Not found: '/catalog/product_compare/add/product/18/uenc/aHR0cDovL2Utb25iYXR0ZXJpZXMuY29tL2luZGV4LnBocC8xMnYtNTBhaC1ibHVldG9vdGgtZW5hYmxlZC1saWZlcG80LXNtYXJ0LWJhdHRlcnkuaHRtbA,,/form_key/Eys5yMCszr27UPFV/'