jos-Error: Category is unpublished or does not exist

JSite -> dispatch() @ /var/www/html/index.php:42
JComponentHelper :: renderComponent() @ /var/www/html/includes/application.php:194
JComponentHelper :: executeComponent() @ /var/www/html/libraries/expans/application/component/helper.php:348
require_once() @ /var/www/html/libraries/expans/application/component/helper.php:380
JController -> execute() @ /var/www/html/components/com_phocagallery/phocagallery.php:51
PhocaGalleryController -> display() @ /var/www/html/libraries/expans/application/component/controller.php:761
JController -> display() @ /var/www/html/components/com_phocagallery/controller.php:30
PhocaGalleryViewCategory -> display() @ /var/www/html/libraries/expans/application/component/controller.php:722
JView -> get() @ /var/www/html/components/com_phocagallery/views/category/view.html.php:669
PhocagalleryModelCategory -> getCategory() @ /var/www/html/libraries/expans/application/component/view.php:386
JError :: raiseError() @ /var/www/html/components/com_phocagallery/models/category.php:173
JError :: raise() @ /var/www/html/libraries/expans/error/error.php:251