Fatal error: Uncaught TypeError: Unsupported operand types: string - int in /home/muungwan/public_html/wp-content/plugins/nd-learning/inc/functions/functions.php:42 Stack trace: #0 /home/muungwan/public_html/wp-content/plugins/nd-learning/addons/visualcomposer/courses/layout/layout-7.php(67): nd_learning_get_course_availability(1693) #1 /home/muungwan/public_html/wp-content/plugins/nd-learning/addons/visualcomposer/courses/index.php(60): include('/home/muungwan/...') #2 /home/muungwan/public_html/wp-includes/shortcodes.php(434): nd_learning_vc_shortcode_courses(Array, '', 'nd_learning_cou...') #3 [internal function]: do_shortcode_tag(Array) #4 /home/muungwan/public_html/wp-includes/shortcodes.php(273): preg_replace_callback('/\\[(\\[?)(nd_lea...', 'do_shortcode_ta...', '[nd_learning_co...') #5 /home/muungwan/public_html/wp-content/plugins/js_composer/include/helpers/helpers.php(240): do_shortcode('[nd_learning_co...') #6 /home/muungwan/public_html/wp-content/plugins/js_composer/include/templates/shortcodes/vc_column.php(94): wpb_js_remove_wpautop('[nd_learning_co...') #7 /home/muungwan/public_html/wp-content/plugins/js_composer/include/classes/shortcodes/core/class-wpbakeryshortcode.php(271): require('/home/muungwan/...') #8 /home/muungwan/public_html/wp-content/plugins/js_composer/include/classes/shortcodes/core/class-wpbakeryshortcode.php(244): WPBakeryShortCode->loadTemplate(Array, '[nd_learning_co...') #9 /home/muungwan/public_html/wp-content/plugins/js_composer/include/classes/shortcodes/core/class-wpbakeryshortcode.php(366): WPBakeryShortCode->content(Array, '[nd_learning_co...') #10 /home/muungwan/public_html/wp-content/plugins/js_composer/include/helpers/helpers.php(1317): WPBakeryShortCode->output(Array, '[nd_learning_co...') #11 /home/muungwan/public_html/wp-includes/shortcodes.php(434): vc_do_shortcode(Array, '[nd_learning_co...', 'vc_column') #12 [internal function]: do_shortcode_tag(Array) #13 /home/muungwan/public_html/wp-includes/shortcodes.php(273): preg_replace_callback('/\\[(\\[?)(nd_lea...', 'do_shortcode_ta...', '[vc_column css=...') #14 /home/muungwan/public_html/wp-content/plugins/js_composer/include/helpers/helpers.php(240): do_shortcode('[vc_column css=...') #15 /home/muungwan/public_html/wp-content/plugins/js_composer/include/templates/shortcodes/vc_row.php(156): wpb_js_remove_wpautop('[vc_column css=...') #16 /home/muungwan/public_html/wp-content/plugins/js_composer/include/classes/shortcodes/core/class-wpbakeryshortcode.php(271): require('/home/muungwan/...') #17 /home/muungwan/public_html/wp-content/plugins/js_composer/include/classes/shortcodes/vc-row.php(40): WPBakeryShortCode->loadTemplate(Array, '[vc_column css=...') #18 /home/muungwan/public_html/wp-content/plugins/js_composer/include/classes/shortcodes/core/class-wpbakeryshortcode.php(366): WPBakeryShortCode_Vc_Row->content(Array, '[vc_column css=...') #19 /home/muungwan/public_html/wp-content/plugins/js_composer/include/helpers/helpers.php(1317): WPBakeryShortCode->output(Array, '[vc_column css=...') #20 /home/muungwan/public_html/wp-includes/shortcodes.php(434): vc_do_shortcode(Array, '[vc_column css=...', 'vc_row') #21 [internal function]: do_shortcode_tag(Array) #22 /home/muungwan/public_html/wp-includes/shortcodes.php(273): preg_replace_callback('/\\[(\\[?)(nd_lea...', 'do_shortcode_ta...', '<p>[vc_row][vc_...') #23 /home/muungwan/public_html/wp-includes/class-wp-hook.php(324): do_shortcode('<p>[vc_row][vc_...') #24 /home/muungwan/public_html/wp-includes/plugin.php(205): WP_Hook->apply_filters('<p>[vc_row][vc_...', Array) #25 /home/muungwan/public_html/wp-includes/post-template.php(256): apply_filters('the_content', '[vc_row][vc_col...') #26 /home/muungwan/public_html/wp-content/plugins/nd-shortcodes/addons/templates/page/layout/layout-3.php(77): the_content() #27 /home/muungwan/public_html/wp-content/plugins/nd-shortcodes/addons/templates/page/index.php(28): include('/home/muungwan/...') #28 /home/muungwan/public_html/wp-includes/class-wp-hook.php(324): nicdark_page('') #29 /home/muungwan/public_html/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters('', Array) #30 /home/muungwan/public_html/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #31 /home/muungwan/public_html/wp-content/themes/educationpack/page.php(3): do_action('nicdark_page_nd') #32 /home/muungwan/public_html/wp-includes/template-loader.php(106): include('/home/muungwan/...') #33 /home/muungwan/public_html/wp-blog-header.php(19): require_once('/home/muungwan/...') #34 /home/muungwan/public_html/index.php(17): require('/home/muungwan/...') #35 {main} thrown in /home/muungwan/public_html/wp-content/plugins/nd-learning/inc/functions/functions.php on line 42