You are doing nothing wrong. It's just that your webhoster did not configure the restore wizard correctly.
Also your webhoster has to keep in mind that myLittleAdmin restore wizard is a good way to restore backup file previously processed on the same server.
If your webhosters needs a way to allow his customers restoring their databases from backup previously processed on other servers (another webhoster, customer development server, etc.) then he needs to offer myLittleBackup (more info on
http://www.mylittlebackup.com)