gistfile1.txt

// attempts to get flash/session accessible in any template
// - this middleware function fails and keep producing 'Error: req.flash() requires sessions'
// - this middleware has been place *after* session middleware in the stack
app.use(function(req,res, next){
	console.log("flash middleware")
	res.locals({
		session	: req.session,
		flash	: req.flash()
	});
}); 

thanks @AlejandroMG, I'm was with "req.flash() requires sessions" error too, and this works for me as well.