WP Error : Unable to locate WordPress Content directory (WP 2.8) Solution

You can’t update yours plugins online directly, cause of the following message :

“Unable to locate WordPress Content directory”

Try this patch to copy in wp-config.php, at the end of your file :

if(is_admin()) {
	add_filter('filesystem_method', create_function('$a', 'return "direct";' ));
	define( 'FS_CHMOD_DIR', 0751 );
}

Many thank to mcarretero !
Read the rest here :  http://tecnologia.simpleyclaro.com.ar/solucion-a-los-problemas-ftp-en-wordpress-2-8/