Sony + Ericsson = SonyEricsson
To get your MP3 files in the correct format for a SonyEricsson mobile (possibly this is only required for Vodafone?), do a Google search for Sony Ericsson DRM Packager. You should be able to find a MicrosoftWindows program that modifies your MP3 files into some DRM format.
lib/main.php:944: Notice: PageInfo: Cannot find action page