Hi Marcus!
Another student helped me spot something that needed to be updated with the how-to-gutenberg-plugin plugin.
If you could try the process again:
1. Downloading this plugin – https://github.com/zgordon/how-to-gutenberg-plugin
2. Don’t bother installing, just open and run npm install
3. Check to see that the node_modules folder is not empty
4. Try running npm run dev to see if it works without error now
If this doesn’t work I am going to send you a simple NPM project to test what the other problem may be causing this.
Also, what version of NPM and version of Node do you have?
You can run npm --version and node --version