Why isn't the add to cart button working on my Dawn theme site?

[DA5]

Hi there. 

My site: www.caraccessoryin.com

The add to cart button not working. 

Theme: Dawn.

Is it the theme issue or code issue? Anyone knows the solution. 

Many thanks!

[PaulNewton]

There's an issue with your product_form.js

Uncaught TypeError: Cannot read properties of null (reading 'querySelector')
    at HTMLElement.handleErrorMessage....

If you modified that file or possibly changed other files you'll want to rollback to a theme backup if you made one.

If you recently installed an app you may want to disable it and retest your themes.

If you recently uninstalled an app there may be left over code you need to remove.

Otherwise you will need to debug your theme and find the source of the errors.

If you need diagnosis and fixing contact me at paull.newton+shopifyforums@gmail.com with any relevant details.