Smarty error: 'unrecognized tag...'

If you get the unrecognized tag... Smarty error after adding JavaScript code (tracking code for example) to a template, most probably the inserted JavaScript contains { and } tags. { and } are the Smarty delimiters, so Smarty falsely wants to interpret the JavaScript code in the template.

To avoid the error:

1. Open the template where you added the code.
2. Enclose the JavaScript code in a {literal}...{/literal} block to prevent Smarty from parsing it:
   

   {literal}
   your JavaScript code
   {/literal}

3. Save the file.