Fatal error: Uncaught Error: Call to a member function have_posts() on null in /home/customer/www/dianewing.com/public_html/wp-content/plugins/tutor/templates/shortcode/tutor-course.php:22 Stack trace: #0 /home/customer/www/dianewing.com/public_html/wp-content/plugins/oxygen-tutor-lms/elements/CoursesList.php(68): include_once() #1 /home/customer/www/dianewing.com/public_html/wp-content/plugins/oxygen/component-framework/api/oxygen.element.class.php(134): Oxygen\TutorElements\CoursesList->render(Array, Array, '') #2 /home/customer/www/dianewing.com/public_html/wp-includes/shortcodes.php(356): OxygenElement->shortcode(Array, '', 'oxy-courses-lis...') #3 [internal function]: do_shortcode_tag(Array) #4 /home/customer/www/dianewing.com/public_html/wp-includes/shortcodes.php(228): preg_replace_callback('/\\[(\\[?)(ct_hea...', 'do_shortcode_ta...', '[ct_headline ct...') #5 /home/customer/www/dianewing.com/public_html/wp-content/plugins/oxygen/component-framework/components/classes/div-block.class.php(47): do_shortcode('[ct_head in /home/customer/www/dianewing.com/public_html/wp-content/plugins/tutor/templates/shortcode/tutor-course.php on line 22