It is probable that the host you were downloading from went off line. It is somewhat inconsiderate, you may think for them to do that, but I'm afraid it happens all the time and is one of the "joys" of file sharing. It is also possible that the host had to disconnect for a short time and may come back on shortly. Depending on the size of the file and your patience, it might be a good idea to re-search for the item, and if you find another sourse, try downloading that one instead. You could stop the download and try to resume it later, which you can do from te Limewire Library>incomplete files. If you do that and it appears as "awaiting sources" sometimes re-searching the item can kick start the download into re-starting.
BTW PLEASE do not double post I hope this helps