The demo content often includes the WooCommerce shopping pages (cart, checkout, my account, and shop index). After you have imported the demo content, make sure these pages are correctly setup by following the directions below.
Step 1) You can set your Shop index page under WooCommerce > Settings > Products > Display:
Step 2) Then set your Cart, Checkout under WooCommerce > Settings > Checkout.
Step 3) Lastly, set your My Account page under WooCommerce > Settings > Accounts.