FILE_DATA_PORTS error in Snort, SOLVED

I'm basically putting this post up for Google to index it and maybe it'll help some people solve the problem in the future.

PortVar Lookup failed on '$FILE_DATA_PORTS'

If you came to this blog post by searching for the above error, or if you have the above error in Snort, you should read this post on the VRT blog that we wrote.  It'll help solve your problem:

http://vrt-blog.snort.org/2011/11/say-hello-to-file-identify-category.html

There. Check that out.