The site name is the same as the name of a storefront item in the Commerce Control Panel. Enter a different site name or remove the existing storefront item.

Error:

The site name is the same as the name of a storefront item in the Commerce Control Panel. Enter a different site name or remove the existing storefront item.

Solution:

Remove the sitename entry already created with the same name under /sitecore/Commerce/Commerce Control Panel/Storefront Settings/Storefronts