getting error in backed after upgrade shop ware in 5.6.6

[ansarhusain]

Fatal error : Uncaught SmartyException: Unable to load template snippet ‘backend/index/auth.tpl|backend/swag_digital_publishing/icons.tpl|backend/swag_fuzzy/menu_entry.tpl|backend/paypal_unified/menu_icon.tpl|backend/swag_business_essentials/menu_entry.tpl|backend/foundation_menu_item.tpl|backend/neti_foundation/extensions/header/css.tpl|backend/index/cwbsagepaycwsw/index.tpl|backend/swag_import_export/menu_entry.tpl|backend/viison_common/header.tpl|backend/viison_pickware_erp/base/header.tpl’ in /var/www/html/engine/Library/Smarty/sysplugins/smarty_internal_templatebase.php:127 Stack trace: #0 /var/www/html/engine/Library/Enlight/View/Default.php(295): Smarty_Internal_TemplateBase->fetch() #1 /var/www/html/engine/Library/Enlight/Controller/Plugins/ViewRenderer/Bootstrap.php(212): Enlight_View_Default->render(Object(Enlight_Template_Default)) #2 /var/www/html/engine/Library/Enlight/Controller/Plugins/ViewRenderer/Bootstrap.php(238): Enlight_Controller_Plugins_ViewRenderer_Bootstrap->renderTemplate(Object(Enlight_Template_D in  /var/www/html/engine/Library/Smarty/sysplugins/smarty_internal_templatebase.php  on line  127