Error: 404 Not Found

Sorry, the requested URL 'http://listet.dk/index.php?option=com_mailto&tmpl=component&link=aHR0cDovL2xpc3RldC5kay9pbmRleC5waHA/b3B0aW9uPWNvbV9jb250ZW50JnZpZXc9YXJ0aWNsZSZpZD0xMjA6ZW5oZWRzbGlzdGVuJmNhdGlkPTI6c2VuZXN0ZSZJdGVtaWQ9NQ==' caused an error:

Not found: '/index.php'