Um i'm stuck in the malfoys dungeon

i'm collected the flowers and popsicle and built the cauldren.

i'm rolling into the barrells on the left (like walkthrough said to do) but i just keep getting coins...

i've tried all sides of the barrells but no luck.
am i missing something?
i've tried rolling with all the characters but still nothing :(
Do i have to get the items in a certain order?

i'm going mad here - a little help please :/

TIA