I get an ' Error opening configuration file' error when clicking 'Add to cart'.

[KB]

If you get the following error when hitting the 'add to cart' button on any product in a particular section:

A General Script Error Occurred

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Error: Error opening configuration file ../acatalog/A000*.cat. No such file or directory

check that the 'Include in Sitemap' option is ticked for the section (on the 'General' tab) that the products are in and update your site.