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Make sure that you translated the product categories properly. Refer to these links:
Also, try to reset the permalink on Settings > Permalink panel. Click the “Save” button once to flush the permalink settings.
It works now. Your “Base personalizzata” value on this page: http://www.cosamimettooggi.com/tmp/wp-admin/options-permalink.php?settings-updated=true broke the permalink. I set it back to “product” and the product single page loads now.
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