help

please help
i try to build my own live cd for ubuntu 11.4 with uck-gui but when select the “Continue building” i have this massage:
wget: missing URL
Usage: wget [OPTION]… [URL]…

Try `wget --help’ for more options.
Unable to download gfxboot-theme-ubuntu source package from

Build ended at 2011-09-21 15:40:26
what i shall do ???

gfxboot-theme-ubuntu is in the main repository, so are you sure you’re connected to the internet ?