In looking at the picture it appears you're probably knitting in two colors. Could the colors be abbreviated sn and sh? If so then this is what it looks like to me. Does it make sense with the pattern?
P6sn- purl 6 in color sn
Join in color sh
P12sh- purl 12 in color sh
Incsh- increase in color sh
Cute pattern. Here is the page with errata