When I add items to my cart and the click on the Cart button, I get the following error:

500: Internal Server Error

Template fallback

An error occurred while rendering the template website_sale.cart.

If this error is caused by a change of yours in the templates, you have the possibility to reset the template to its factory settings.

• Shopping Cart

The error occurred while rendering the template website_sale.cart

Error while rendering the template:
    SyntaxError: t-call must be on a <t> element (actually on <div>).
    Template: website_sale.cart
    Reference: 2102
    From: (2102, '/t/t', '<t t-call="website_sale.checkout_layout"/>')