I've made marshmallow fondant tons of times and today, made a buttercream fondant for the first time. 8 times out of 10, my marshmallow fondant doesn't turn out and I have to make it again. Today, I tried the buttercream hoping it wouldn't give me the same problems but, same issue. Can anyone tell me what I'm doing to cause this issue? Take a look at the photo attached...this pic was of the buttercream, but looks exactly as the marshmallow fondant does when it doesn't turn out.