The plaz also refers to these steps :
We needed to set "System"> "Configuration"> "Web"> "URL parameters", change "Add store code" to "Yes". Then we were able to initialize Mage :: app () in the correct repository code, and the URL to add to the cart is then correctly routed to the product site.
Causes
Javascript error. Most likely, the problem is due to a javascript error on your page. If you don't have javascript errors, you need to find a couple more things.
Save URL. Access to the site can be obtained through the address: eshop.com, as well as www.eshop.com. If you install your store as eshop.com, then if you will access your store through www.eshop.com, adding to the basket will not work on the main page. So here may be the root of the problem.
Mixed domains: Make sure your product page is in the same domain as the Magento installation. Problems with SSL certificates: SSL errors can be caused by improper environment settings, a bad server certificate, connection problems, certificate expiration, etc.
Server side issues. . Your hosting provider (especially if you use shared hosting) can implement any changes that lead to reduced functionality. How to fix
Here are some tips and tricks on how to fix this and make store sales again.
- You can redirect from www.eshop.com to eshop.com or vice versa.
- Also try this method: System-> Configuration-> WEB-> Cookie Session. Set Cookie Lifetime to: 86400. Then clear the entire cache. The decision depends on which case applies to you.