On PrestaShop 1.6 on some pages of front end I'm getting the below error and all pages of admin when I'm trying to login I'm getting this error
Fatal error: Uncaught --> Smarty: Invalid compiled template for
'/modules/blockbestsellers/views/templates/hook/tab.tpl' <-- thrown in
/tools/smarty/sysplugins/smarty_internal_templatebase.php on line 182
Try to clear cache deleting the content except index.php of this folders
rootofps/cache/smarty/cache, be carefull, not the folders but the content. By the way, it's the 'blockbestsellers' that have a problem.