Jenkins "Multibranch Pipeline Project" Tutorial Error

Question

I'm following this tutorial on the Jenkins official docs.

This tutorial shows you how to use Jenkins to orchestrate building and testing a simple Node.js and React application with the Node Package Manager (npm), as well as deliver different outcomes for development and production purposes.

Everything was pretty straight forward, but I came across this error when I got to "Run your Pipeline on the production branch" portion of the guide, link here.

Error Received

+ sleep 1
+ ./node_modules/serve/bin/serve.js -c 0 -s build
/var/jenkins_home/workspace/Aviato-Team_production-OZ2WCGEMEZUSDYGKYBCG4BWFXFVS2KVB47HNPHOYCFLEP7JEO52Q/node_modules/serve/bin/serve.js:83

detect(port).then(async open => {
                  ^^^^^

SyntaxError: missing ) after argument list
    at createScript (vm.js:56:10)
    at Object.runInThisContext (vm.js:97:10)
    at Module._compile (module.js:549:28)
    at Object.Module._extensions..js (module.js:586:10)
    at Module.load (module.js:494:32)
    at tryModuleLoad (module.js:453:12)
    at Function.Module._load (module.js:445:3)
    at Module.runMain (module.js:611:10)
    at run (bootstrap_node.js:387:7)
    at startup (bootstrap_node.js:153:9)

+ echo 193
+ set +x

Now...
Visit http://localhost:5000 to see your Node.js/React application in action.
(This is why you specified the "args -p 5000:5000" parameter when you
created your initial Pipeline as a Jenkinsfile.)

I followed their guide step by step, using their very own repository and setup code. The only thing I changed was that instead of creating a pipeline with Git, instead I'm using GitHub, as noted here in the guide.

When I navigate to http://localhost:5000 nothing shows up.

Some things to note (in case it helps):

1. My docker is installed on Windows 10 OS
2. I'm using GitHub as opposed to Git (already mentioned)
3. Tutorial is using BlueOcean to create pipeline

How do I fix this error? I'm still learning and following this guide, so since this error is out of my control I'm not sure how to fix it.

Edit: My terminal on my Win10 machine is outputting this if it helps:

Apr 20, 2018 4:02:23 AM com.squareup.okhttp.internal.Platform$JdkWithJettyBootPlatform getSelectedProtocol
INFO: ALPN callback dropped: SPDY and HTTP/2 are disabled. Is alpn-boot on the boot class path?
Apr 20, 2018 4:04:40 AM org.jenkinsci.plugins.workflow.support.steps.input.POSTHyperlinkNote <init>
WARNING: You need to define the root URL of Jenkins
Apr 20, 2018 4:04:40 AM org.jenkinsci.plugins.workflow.support.steps.input.POSTHyperlinkNote <init>
WARNING: You need to define the root URL of Jenkins

Here's my GitHub if you want to see the production branch code.