Fatal error: Uncaught TypeError: Argument 1 passed to WP_Translation_Controller::set_locale() must be of the type string, null given, called in /home/astronom/public_html/eschool/wp-includes/l10n.php on line 803 and defined in /home/astronom/public_html/eschool/wp-includes/l10n/class-wp-translation-controller.php:87 Stack trace: #0 /home/astronom/public_html/eschool/wp-includes/l10n.php(803): WP_Translation_Controller->set_locale(NULL) #1 /home/astronom/public_html/eschool/wp-includes/l10n.php(1015): load_textdomain('rich-contact-wi...', '/home/astronom/...', NULL) #2 /home/astronom/public_html/eschool/wp-content/plugins/rich-contact-widget/rich-contact-widget.php(599): load_plugin_textdomain('rich-contact-wi...', false, 'rich-contact-wi...') #3 /home/astronom/public_html/eschool/wp-settings.php(522): include_once('/home/astronom/...') #4 /home/astronom/public_html/eschool/wp-config.php(98): require_once('/home/astronom/...') #5 /home/astronom/public_html/eschool/wp-load.php(50): require_once('/home/astronom/...') #6 /hom in /home/astronom/public_html/eschool/wp-includes/l10n/class-wp-translation-controller.php on line 87

Fatal error: Uncaught TypeError: Argument 1 passed to WP_Translation_Controller::set_locale() must be of the type string, null given, called in /home/astronom/public_html/eschool/wp-includes/l10n.php on line 803 and defined in /home/astronom/public_html/eschool/wp-includes/l10n/class-wp-translation-controller.php:87 Stack trace: #0 /home/astronom/public_html/eschool/wp-includes/l10n.php(803): WP_Translation_Controller->set_locale(NULL) #1 /home/astronom/public_html/eschool/wp-includes/l10n.php(959): load_textdomain('default', '/home/astronom/...', NULL) #2 /home/astronom/public_html/eschool/wp-includes/class-wp-fatal-error-handler.php(49): load_default_textdomain() #3 [internal function]: WP_Fatal_Error_Handler->handle() #4 {main} thrown in /home/astronom/public_html/eschool/wp-includes/l10n/class-wp-translation-controller.php on line 87