I'm stuck in the malfoy dungeon ... I've gotten the popsicle and flowers into the cauldren but cant get the spider out of the barrells!!!

I keep rolling into them from all sides but no luck. I've tried all the characters. Have even had them standing onthe green lever of the barrel that rocks on the left side... All i keep getting is coins... I've collected over 200,000 coins.

:/

What am i doing wrong?

*on hands and knees begging* please help me please please please!!!

Tia