woocommerce conflict with the theme

I tried to install woocommerce on my theme and it all worked find untill the checkout page.
in the checkout page i cant see the shipment or payment methods nor the items i ordered.
but if i changed the theme to tewentytwo every thing works fine.
i tried to use <?php woocommerce_content(); ?> but it didnt work , i tried the hooks method but i dont think i did it right.

thats my site: https://shop.referenceavs.com/checkout

ps: the theme keep alerting that : Your theme does not declare WooCommerce support