WP_Ajax_Upgrader_Skin::error( string|WP_Error $errors, mixed $args )

114	public function error( $errors, ...$args ) {115		if ( is_string( $errors ) ) {116			$string = $errors;117			if ( ! empty( $this->upgrader->strings[ $string ] ) ) {118				$string = $this->upgrader->strings[ $string ];119			}120 121			if ( str_contains( $string, '%' ) ) {122				if ( ! empty( $args ) ) {123					$string = vsprintf( $string, $args );124				}125			}126 127			// Count existing errors to generate a unique error code.128			$errors_count = count( $this->errors->get_error_codes() );129			$this->errors->add( 'unknown_upgrade_error_' . ( $errors_count + 1 ), $string );130		} elseif ( is_wp_error( $errors ) ) {131			foreach ( $errors->get_error_codes() as $error_code ) {132				$this->errors->add( $error_code, $errors->get_error_message( $error_code ), $errors->get_error_data( $error_code ) );133			}134		}135 136		parent::error( $errors, ...$args );137	}