I want to activate it after installing an extension, but I get this error.
Notice: Undefined index: user_token in /var/www/"""/html/opencart/admin/controller/extension/feed/gcrdev_sitemap.php on line 142Notice: Undefined index: user_token in /var/www/"""/html/opencart/admin/controller/extension/feed/gcrdev_sitemap.php on line 146Notice: Undefined index: user_token in /var/www/"""/html/opencart/admin/controller/extension/feed/gcrdev_sitemap.php on line 150Notice: Undefined index: user_token in /var/www/"""/html/opencart/admin/controller/extension/feed/gcrdev_sitemap.php on line 153Notice: Undefined index: user_token in /var/www/web1"""43509/html/opencart/admin/controller/extension/feed/gcrdev_sitemap.php on line 154 Fatal error: Uncaught exception 'Twig_Error_Loader' with message 'Unable to find template "extension/feed/gcrdev_sitemap.twig" (looked into: /var/www/"""/html/opencart/admin/view/template).' in /var/www/"""/html/opencart/system/library/template/Twig/Loader/Filesystem.php:215 Stack trace: #0 /var/www/"""/html/opencart/system/library/template/Twig/Loader/Filesystem.php(139): Twig_Loader_Filesystem->findTemplate('extension/feed/...') #1 /var/www/""""/html/opencart/system/library/template/Twig/Environment.php(312): Twig_Loader_Filesystem->getCacheKey('extension/feed/...') #2 /var/www/""""/html/opencart/system/library/template/Twig/Environment.php(378): Twig_Environment->getTemplateClass('extension/feed/...', NULL) #3 /var/www/"""""/html/opencart/system/store/modification/system/library/template/twig.php(42): Twig_Environment->loadTemplate('extension/feed/...') #4 /var/www/""""/html/opencart/system/library/template.php(51): Template\Twig->render('extension/feed/...', '1') #5 /var/www/web143 in /var/""""/html/opencart/system/library/template/Twig/Loader/Filesystem.php on line 215