Can you fix a Smarty template (.tpl) compile error?

Yes. Smarty: Syntax error in template or unknown tag usually comes from a deprecated {template} include, a missing {block}, or a stale compiled file in var/cache/prod/smarty/compile. We fix the offending .tpl, clear the Smarty compile cache, and verify every page that uses the template, product, category, checkout and CMS, renders correctly.