I recently ran into this error while using ColdFusion 9 on a Mac. I was trying to use the new feed() function in cfscript. So naturally, I Googled it to see if anybody else had ran into the same thing. Well, Todd Sharp had, so I went into my cfadmin and checked my Custom Tag Paths.

Oddly enough, my tag path was there!

Really weird. I opened the path in Finder, and there were a few cfcs, but feed was specifically missing (there were others too).

So I checked another server (Windows) and it had them all! I copied them from one server to the other, and everything worked. I'm not sure why they didn't install on the Mac but they weren't there.

Thanks Todd for sending me in the right direction.