Building delivery customizations

[ayushmukho]

Whenever I try to run this command 

npm run shopify app generate extension -- --type delivery_customization --name=delivery-customization --template=rust

In my app development folder, I am getting an error that 

The following extension types are supported: theme_app_extension, subscription_ui, │
│ checkout_ui, post_purchase_ui, web_pixel, product_discount, order_discount, │
│ shipping_discount 

[SB_90]

Hi @ayushmukho 

This seems to suggest that there's something outdated or a permissions issue, that's the only thing I can think of off the top of my head.

Is the app already installed on a store?

Presumably, all the requirements from this page are satisfied.

[Nick_Wesselman]

Hi @ayushmukho --

It looks like you need to upgrade to the latest version of Shopify CLI.

npm run shopify upgrade