First verify your woocommerce settings are correctly setup. Visit to the Woocommerce > Status link and check all the green signals.

Make sure the relative woocommerce shortcodes exists on the assigned pages.
[woocommerce_cart] # shows the cart page
[woocommerce_checkout] # shows the checkout page
[woocommerce_my_account] # shows the user account page
[woocommerce_order_tracking] # shows the order tracking form