Hi there Peeps

I'm doing a model of a gargoyle and have just stitched the two halves of the polygon model together, however when I then try to convert that polygon model to subdivisions it refuses to do so telling to check script which has all this baffling info.

Im sure this has been covered and I remember the problem being addressed in one of the tutorials on here, but there are so many tutorials I have no idea which one it is. So I wonder if anyone can help me out with the problem.

I have attached a smoothed polygon image of the gargoyle I am doing (don't worry I kept the low mesh polygon model ;OP)

Hope you guys can help. Once I sorted this problem, I will then add a stone texture to the model.
Thanks