If you have not already converted the hut, you need to instruct a villager to do so (by dropping them on the hut).
However, you need a villager with a specific tech specialty at a particular level. (Cant give all the answers away!)

_________________________
My VV2 story, "A Twist of Fate" And don't miss Krystal's stories, all three of them!
"Life is too fast... unless you're in traffic."