Error using M-commerce and Paypal

Hi.

I’m using Siberian SAE (Free) 4.0.2 and M-commerce Feature.

I have configured my app to use Paypal (using this document: http://doc.siberiancms.com/knowledge-base/how-to-configure-paypal-for-the-m-commerce-feature/), but I can’t buy anything.

When I log in Paypal and I pay, it seems all ok, but in the last step, it calls to this url: http://www.mydomain.com/overview/mcommerce/mobile_sales_confirmation/confirm?token=EC-XXXXXXXXXxN&PayerID=RPXXXXXXXXXXXX and it shows in screen this characters: ‘[]’ and does nothing more.

I don’t know what to do.

Can you help me, please?

Thank you.