Error - About Cart AJAX response and function extension

[azy]

same issue of follwoing topics.

Change online store handles error messages in the cart and checkout validation API?

I am serving an app using the cart and checkout validation api. In some themes, when I press the “Add to Cart” button and the cart and check out validation api returns an error, the error message is no longer displayed. Attached is an example from Dawn. Below is an example of the “Dawn” theme. Until now, a message was displayed when you clicked the “Add to Cart” button. [message-01] However, I am currently unable to display the error message. This is thought to be due to a change in the r…