Failed to add product to shopping cart

If adding a configured e-commerce product to the shopping cart fails, go to the product detail page, delete the add-to-cart button, and add it again.

Click system page management at the bottom of the page panel on the left to access your system pages.

From the system page list, click product detail page to open it for editing.

In the widget panel on the left, select the e-commerce category, find the purchase button widget, and drag it onto the product detail page on the right to add it again.