The links to music files on the site are relative; that is, they point to the file-name only, so if the files are not in the same directory as the pages on the server, they won't work.  An "absolute" link would include "http://" as part of the file-path.  The error message I get reads "C:\PROGRAM FILES\YUANSOFT\ALTOMP3 MAKER\output\The%20First%20GoodFriday.m3u", which suggests to me that the pages have been made using html-writing software, and the file-path refers to files on the compiler's own computer rather than to the files on the server, assuming that they are there somewhere.  This is an annoying feature of some html writing programmes that put in hyperlinks automatically, and often leads to invisible pictures and so on on websites; the site builder can see them, but nobody else can!

Of course, it could be something else entirely...

Malcolm