Fatal error: Uncaught TypeError: Argument 1 passed to WP_Translation_Controller::set_locale() must be of the type string, null given, called in /home/papadellis/wp-includes/l10n.php on line 803 and defined in /home/papadellis/wp-includes/l10n/class-wp-translation-controller.php:87 Stack trace: #0 /home/papadellis/wp-includes/l10n.php(803): WP_Translation_Controller->set_locale() #1 /home/papadellis/wp-includes/l10n.php(1015): load_textdomain() #2 /home/papadellis/wp-content/plugins/uncode-js_composer/include/classes/core/class-vc-manager.php(212): load_plugin_textdomain() #3 /home/papadellis/wp-includes/class-wp-hook.php(324): Vc_Manager->pluginsLoaded() #4 /home/papadellis/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters() #5 /home/papadellis/wp-includes/plugin.php(517): WP_Hook->do_action() #6 /home/papadellis/wp-settings.php(555): do_action() #7 /home/papadellis/wp-config.php(102): require_once('/home/papadelli...') #8 /home/papadellis/wp-load.php(50): require_once('/home/papadelli...') #9 /home/papadellis/wp in /home/papadellis/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/papadellis/wp-includes/l10n.php on line 803 and defined in /home/papadellis/wp-includes/l10n/class-wp-translation-controller.php:87 Stack trace: #0 /home/papadellis/wp-includes/l10n.php(803): WP_Translation_Controller->set_locale() #1 /home/papadellis/wp-includes/l10n.php(959): load_textdomain() #2 /home/papadellis/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/papadellis/wp-includes/l10n/class-wp-translation-controller.php on line 87