Hi
I just baked some peanut butter cupcakes and went on to do the cream cheese frosting but it is far too runny and not at all what it looks like in the book. I am supposed to pipe it but I can't see how! I know what you're thinking maybe I got the amounts wrong, but I am sure I weighed the ingredients out correctly. 
The recipe reads:
200g full fat soft cream cheese
25g butter, softened
225g Icing sugar
Now I am quite an amateur at baking, but I used royal icing sugar. Is there a difference? I can't see where else I may have gone wrong.
Any thoughts and tips would be greatly appreciated!
Thanks