Stack Trace for error

code.js

//mg is alias for require('mongoose')
mg.connect('mongodb://localhost/local');
User.find({}, function(errors, users) {
	mg.connection.close();
	res.render('index', {
		title: 'Example Page',
		users: users
	});
});

Stack Trace

Error: Can't use mutable header APIs after sent.
    at ServerResponse.getHeader (http.js:521:11)
    at ServerResponse.header (/usr/local/lib/node/.npm/express/2.0.0beta/package/lib/response.js:225:17)
    at ServerResponse.send (/usr/local/lib/node/.npm/express/2.0.0beta/package/lib/response.js:65:17)
    at ServerResponse.render (/usr/local/lib/node/.npm/express/2.0.0beta/package/lib/view.js:301:10)
    at ServerResponse.render (/usr/local/lib/node/.npm/express/2.0.0beta/package/lib/view.js:295:10)
    at /home/jeff/Programs/JavaScript/scrappersave/src/controllers/UserController.js:11:9
    at /usr/local/lib/node/.npm/mongoose/1.1.3/package/lib/mongoose/query.js:558:22
    at model.<anonymous> (/usr/local/lib/node/.npm/mongoose/1.1.3/package/lib/mongoose/document.js:141:5)
    at model.init (/usr/local/lib/node/.npm/mongoose/1.1.3/package/lib/mongoose/document.js:571:33)
    at /usr/local/lib/node/.npm/mongoose/1.1.3/package/lib/mongoose/query.js:556:16