It means you have done something wrong with your include/require function. The error should point to a line like:
code:
include("http://www.domain.com/page.html");
The fix if the site is on the same domain is to do:
code:
include("$DOCUMENT_ROOT/page.html");
if you need to include a file from another domain then try:
code:
@include("http://www.domain.com/page.html");
Tyberius Prime - Note: If you really need to include from a different machine(!), a) that machine must send out the source code, not the output of another php script, b) you'd better not use any $variables within the include(), (now, you better wouldn't do that at all, less an attacker includes code from *her* domain). c) you should really think about what you're doing... this is not gonna be fast, and creates extra traffic on the server.