THANK YOU!!! That solved one of my hurdles, but it was quickly replaced by another.
By any chance did you run out of Java heap space? I'm running this on EC2 on an m1.large instance and I've upped the MAHOUT_HEAPSPACE up to 5G but I'm still getting java.lang.OutOfMemoryError: Java heap space error. (Full message here: http://pastebin.com/P5PYuR8U)