HI,
1. Please go to Appearance > Themes, check the Arnold version if is 1.7.8
If it is not, please upgrade the Arnold theme.
2. Please go to WooCommerce > Settings, click “Advanced” tab, to check if there is a Cart page for “Cart page” selector, screenshot https://www.dropbox.com/s/e7bqx0aga9ycb9q/qq20191118-095438.jpg?dl=0
If there is not, please go to Pages, to check if there is “Cart” page, if not, please add a new page, name it as Cart page.
If there is the cart page, check if there is the shortcodes in the editor.
If there is not, please add it.
[woocommerce_cart]
Go back WooCommerce > Settings, pickup the “Cart” page for the “Cart page” selector
Regards!
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