Getting error on all add to cart links on product listing page.
=> Please assist me. Thanks!
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It can be because of form key. You need to add following line to add form key just after form tag in give file list
<?php echo $this->getBlockHtml('formkey') ?>
1) For Add to cart in product view app/design/frontend/theme/package/template/catalog/product/view.phtml
2) For login & customer registration app/design/frontend/theme/package/template/persistent/customer/form/login.phtml app/design/frontend/theme/package/template/persistent/customer/form/registration.phtml
3) Update cart app/design/frontend/theme/package/template/checkout/cart.phtml
If this is fine then also possible because of new patches. Please Check: Security Patch SUPEE-10415 - Possible Issues?