Unable to start the dev server

I was following the steps here: https://docs.microsoft.com/en-us/office/dev/add-ins/quickstarts/excel-quickstart-jquery?tabs=yeomangenerator

Once I run npm start:

npm start

> office-addin-taskpane-js@0.0.1 start .....\My Office Add-in
> office-addin-debugging start manifest.xml

Debugging is being started...
App type: desktop
Enabled debugging for add-in 05c2e1c9-3e1d-406e-9a91-e9ac64854143. Debug method: 0
Starting the dev server... (webpack-dev-server --mode development)
Unable to start the dev server. Error: The dev server is not running on port 3000.
Sideloading the Office Add-in...
Debugging started.

I am on Windows 10 Please can you help me run the add-in? Would really like to try this out 😃

[akrantz]

@sarahboyce If you go to the directory “c:\users\Sarah Boyce.office-addin-dev-certs”, you could manually install the CA certificate.

1. Double-click the ca.crt file.
2. Click the “Install Certificate…” button.
3. Choose “Current User” and click Next.
4. Choose “Place all certificates in the following store” and click Browse…
5. Select “Trusted Root Certification Authorities” and click OK.
6. Click Next and Finish.

Once the CA certificate is installed, npm run dev-server should be able to run successfully.

[akrantz]

@sarahboyce Run this command: npx office-addin-dev-certs install.

If the certificates are already installed, you’ll see a message:

You already have trusted access to https://localhost.

If the certificates are not installed, it will show a message:

The developer certificates have been generated in C:\Users\adamk\.office-addin-dev-certs
Installing CA certificate "Developer CA for Microsoft Office Add-ins"...

You should then see the dialog asking to install the certificate.

After saying yes, it should then show:

You now have trusted access to https://localhost.

Once the certificates are installed, you should be able to run the dev server without problems.