replace error

[bipower]

I've a js file as following:
var connect = require('connect');
var http = require('http');
var fs=require('fs');

var app = connect();

// gzip/deflate outgoing responses
var compression = require('compression');
app.use(compression());

// store session state in browser cookie
var cookieSession = require('cookie-session');
app.use(cookieSession({
keys: ['secret1', 'secret2']
}))

// parse urlencoded request bodies into req.body
var bodyParser = require('body-parser');
app.use(bodyParser.urlencoded());

var logger= require('connect-logger');
app.use(logger('short'));

app.use(function(req,res,next){
console.error('%s %s', req.method, req.url);
next();
});

app.use(function(req, res,next){
if('GET'==req.method && '/'==req.url){
server(res,__dirname+'/index.html', 'text/html');
}
else{
next();
}
});

app.use(function(req, res ,next){

if('GET'==req.method && '/images'==req.url.substr(0,7) && '.jpg'==req.url.substr(-4)){
    server(res,__dirname+req.url, 'application/jpg');
}else{
    next();
}

});

app.use(function(req, res ,next){

res.writeHead(404);
res.end('Not found');

});

//create node.js http server and listen on port
http.createServer(app).listen(3000);

function server(res,path, type){
res.writeHead(200,{'Coent-Type':type});
fs.createReadStream(path).pipe(res);

}

when run node, the error found:
E:\eclipse42_wk\nodeconn\src\node_modules\connect-logger\lib\logger.js:13
format = format.replace(/%date/g, "\x1b[90m" + (moment().format(options.da
^
TypeError: Cannot call method 'replace' of undefined
at parse (E:\eclipse42_wk\nodeconn\src\node_modules\connect-logger\lib\logge
r.js:13:21)
at ServerResponse.res.end (E:\eclipse42_wk\nodeconn\src\node_modules\connect
-logger\lib\logger.js:41:17)
at ReadStream.onend (_stream_readable.js:485:10)
at ReadStream.g (events.js:180:16)
at ReadStream.emit (events.js:117:20)
at _stream_readable.js:929:16
at process._tickCallback (node.js:419:13)