If blank page appears at the end of submission process
This means woocommerce is not setup properly.
Go to wp-admin > Woocommerce > settings > Account and make sure “My Account is selected”
Then go to “Checkout” and make sure “Cart” and checkout pages are selected in their respective dropdown menus
Another reason why a blank page may appear when you submit listing
Some of the fields are required for each listing type like description, title, tagline etc.. Make sure you have used all required fields in your listing field tab in listing type creator