Fatal error: Uncaught Error: Call to a member function register() on null in /home3/causebl/public_html/wp-includes/widgets.php:123 Stack trace: #0 /home3/causebl/public_html/wp-content/plugins/simple-sidebar-navigation/simple-sidenav.php(679): register_widget('simple_sidenav') #1 /home3/causebl/public_html/wp-includes/class-wp-hook.php(341): {closure}('') #2 /home3/causebl/public_html/wp-includes/class-wp-hook.php(365): WP_Hook->apply_filters(NULL, Array) #3 /home3/causebl/public_html/wp-includes/plugin.php(522): WP_Hook->do_action(Array) #4 /home3/causebl/public_html/wp-settings.php(593): do_action('plugins_loaded') #5 /home3/causebl/public_html/wp-config.php(101): require_once('/home3/causebl/...') #6 /home3/causebl/public_html/wp-load.php(50): require_once('/home3/causebl/...') #7 /home3/causebl/public_html/wp-blog-header.php(13): require_once('/home3/causebl/...') #8 /home3/causebl/public_html/index.php(17): require('/home3/causebl/...') #9 {main} thrown in /home3/causebl/public_html/wp-includes/widgets.php on line 123