Furnace refuses to cook my food.

Killed a few sheep for Raw Mutton, made a new furnace inside a villager's home, stuffed the Raw Mutton and coal into the furnace, nothing is happening. It should be cooking my Raw Mutton but it refuses to.

PC Specs:
HP 15 Windows 10 Home: Anniversary Update
RAM: 3.45 GB
APU: AMD A6-6310 Accelerated Quad-Core
500 GB HDD
15.6" 1366x768 LED Display