关于express：错误：听EADDRINUSE 127.0.0.1:3000

Error: listen EADDRINUSE 127.0.0.1:3000

我使用以下示例来设置快速服务器：https：//github.com/sogko/gulp-recipes/tree/master/browser-sync-nodemon-expressjs。

我使用gulp启动几个过程，如缩小，硫化和折叠我的Polymer项目。

gulpfile.js是364行大，但这是重要的部分：

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// Build and serve the output from the dist build
appsPaths.forEach(function(app) {
gulp.task('serve:dist:' + app,
['browser-sync', 'default:' + app]);
});

gulp.task('browser-sync', ['nodemon'], function () {

// for more browser-sync config options: http://www.browsersync.io/docs/options/
browserSync({
notify: false,
snippetOptions: {
rule: {
match: '<span id="browser-sync-binding"></span>',
fn: function (snippet) {
return snippet;
}
}
},

// informs browser-sync to proxy our expressjs app which would run at the following location
proxy: 'http://localhost:3000',

// informs browser-sync to use the following port for the proxied app
// notice that the default port is 3000, which would clash with our expressjs
port: 4000,

// open the proxied app in chrome
browser: ['google-chrome']
});
});

gulp.task('nodemon', function (cb) {
var called = false;
return $.nodemon({

// nodemon our expressjs server
script: 'server/app.js',

// watch core server file(s) that require server restart on change
watch: ['server/app.js']
})
.on('start', function onStart() {
// ensure start only got called once
if (!called) { cb(); }
called = true;
})
.on('restart', function onRestart() {
// reload connected browsers after a slight delay
setTimeout(function reload() {
browserSync.reload({
stream: false
});
}, BROWSER_SYNC_RELOAD_DELAY);
});
});

现在虽然这很好用，但我仍然得到以下错误，最终在我的gulp日志中：

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^CDaniels-iMac:polymer dani$ gulp serve:dist:domain.com
[22:33:10] Using gulpfile ~/dev/company/polymer/gulpfile.js
[22:33:10] Starting 'nodemon'...
[22:33:10] Starting 'clean:domain.com'...
[22:33:10] Finished 'clean:domain.com' after 8.56 ms
[22:33:10] Starting 'default:domain.com'...
[22:33:10] Starting 'copy:domain.com'...
[22:33:10] Starting 'styles:domain.com'...
[22:33:11] Finished 'styles:domain.com' after 295 ms
[22:33:11] [nodemon] 1.9.2
[22:33:11] [nodemon] to restart at any time, enter `rs`
[22:33:11] [nodemon] watching: server/app.js
[22:33:11] [nodemon] starting `node server/app.js`
[22:33:11] Finished 'nodemon' after 570 ms
[22:33:11] Starting 'browser-sync'...
[22:33:11] Finished 'browser-sync' after 20 ms
events.js:154
throw er; // Unhandled 'error' event
^

Error: listen EADDRINUSE 127.0.0.1:3000
at Object.exports._errnoException (util.js:890:11)
at exports._exceptionWithHostPort (util.js:913:20)
at Server._listen2 (net.js:1234:14)
at listen (net.js:1270:10)
at net.js:1379:9
at GetAddrInfoReqWrap.asyncCallback [as callback] (dns.js:63:16)
at GetAddrInfoReqWrap.onlookup [as oncomplete] (dns.js:82:10)
[22:33:11] [nodemon] app crashed - waiting for file changes before starting...
[BS] Proxying: http://localhost:3000
[BS] Access URLs:
----------------------------------
Local: http://localhost:4000
External: http://10.0.1.28:4000
----------------------------------
UI: http://localhost:3001
UI External: http://10.0.1.28:3001
----------------------------------
[22:33:12] copy all files 16.03 MB
[22:33:12] Finished 'copy:domain.com' after 1.78 s
[22:33:12] Starting 'elements:domain.com'...
[22:33:12] Finished 'elements:domain.com' after 5.39 ms
[22:33:12] Starting 'jshint:domain.com'...
[22:33:12] Starting 'images:domain.com'...
[22:33:12] Starting 'fonts:domain.com'...
[22:33:12] Starting 'html:domain.com'...
[22:33:12] Finished 'images:domain.com' after 339 ms
[22:33:12] Finished 'fonts:domain.com' after 157 ms
[BS] Reloading Browsers...

这是我在触发gulp脚本运行之前和之后看到的：

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Daniels-iMac:polymer dani$ lsof -i tcp:3000
Daniels-iMac:polymer dani$
Daniels-iMac:polymer dani$ lsof -i tcp:3000
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
node 95580 dani 19u IPv4 0x8560662b0408bad3 0t0 TCP localhost:hbci (LISTEN)

所以看起来端口3000上没有太多东西。我该怎么做才能解决这个错误？