Call method of the session template

Hi, I'm using django carton to shopping cart.

I am not able to call the method remove_single in my template. on line 15

I tried several ways but I can not.

If you can help

carton      ---> http://pastebin.com/X4FtHRZU

template  ---> http://pastebin.com/0AJYFB1x

thank you

Ricardo

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