Fatal error: Uncaught exception 'Ucan_Exception' with message 'Invalid category id' in /var/www/html/mobi/application/modules/course/models/resources/Course.php:201 Stack trace: #0 /var/www/html/mobi/application/modules/course/models/CourseCatalog.php(93): Course_Resource_Course->getCoursesByCategory(NULL, NULL, Array) #1 /var/www/html/mobi/application/modules/course/controllers/IndexController.php(45): Course_Model_CourseCatalog->getCoursesByCategory(NULL, NULL, Array) #2 /var/www/html/mobi/library/Zend/Controller/Action.php(516): Course_IndexController->indexAction() #3 /var/www/html/mobi/library/Zend/Controller/Dispatcher/Standard.php(295): Zend_Controller_Action->dispatch('indexAction') #4 /var/www/html/mobi/library/Zend/Controller/Front.php(954): Zend_Controller_Dispatcher_Standard->dispatch(Object(Zend_Controller_Request_Http), Object(Zend_Controller_Response_Http)) #5 /var/www/html/mobi/library/Zend/Application/Bootstrap/Bootstrap.php(97): Zend_Controller_Front->dispatch() #6 /var/www/html/mobi/application/bootstra in /var/www/html/mobi/application/modules/course/models/resources/Course.php on line 201