I am using JAS 0.13.6 with my minecraft 1.6.4 server and the latest version of MCPC+/Cauldron Build 271, and whenever include JAS in the server mod folder I get the following error whenever someone logs in:
[SEVERE] [JAS] Obfuscation needs to be updated to access the currentChunkProvider IChunkProvider. Please notify modmaker Immediately.

Followed by the server restarting.