Wordpress Auto-Update - FTP: FAILURE

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FS_CHMOD_FILE and FS_CHMOD_DIR empty! in: /wp-admin/includes/class-wp-filesystem-ftpext.php

function chmod($file, $mode = false, $recursive = false) {
		if ( ! $mode ) {
			if ( $this->is_file($file) )
				$mode = FS_CHMOD_FILE;
			elseif ( $this->is_dir($file) )
				$mode = FS_CHMOD_DIR;
			else
				return false;
		}

FIX:[taken from:'/wp-admin/includes/file.php']

	// Set the permission constants if not already set.
	if ( ! defined('FS_CHMOD_DIR') )
		define('FS_CHMOD_DIR', 0755 );
	if ( ! defined('FS_CHMOD_FILE') )
		define('FS_CHMOD_FILE', 0644 );

the FS_CHMOD_* defines are defined by the Filesystem loader, ie. they should always be defined unless a plugin or otherwise has already defined them to something else. (This is done by the WP_Filesystem() function)

Can you enable WP_DEBUG mode (without any alterations you've made) and see what errors are displayed? (or logged?)

To enable the Debug mode, ​you simply need to change (or add) the define('WP_DEBUG', true); line to your wp-config.php file file

no reporter-feedback in 10months, seems invalid.