Calling functions in other controllers

I'm still working in cake 1.3.15 (going to upgrade soon) but running into an issue.  I'm setting up a shopping cart so I have functions in my cart_controller like

Cart get()
Cart total()

When I attempt to call these functions in my checkout_controller ...

var $uses = (....'Cart',,,);

function index() {
  $cart = $this->Cart->get();
  $total = $this->Cart->total();

When checking out I get an SQL error about incorrect mysql syntax ... check the manual ...  the next line reads "Query: get".  If I pull the "get" code into the checkout_controller it runs as expected.

What I'm I missing?

Thanks,
Brian

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