Excellent, thank you for providing the screenshot. This image clearly shows the problem, and it's a very common one when setting up a new Node.js project. ### **Analysis of the Error** Based on the terminal output you've provided, here is a step-by-step breakdown of what happened: 1. **`cd mvu1-sim/`**: You correctly navigated into the project directory. 2. **`npm start`**: You correctly tried to run the start script. 3. **`npm WARN Local package.json exists, but node_modules missing, did you mean to install?`**: This is the most important clue. `npm` is telling you that while it sees the "recipe" (`package.json`), it doesn't see the "ingredients" (the actual libraries downloaded into a `node_modules` folder). 4. **`sh: 1: parcel: not found`**: This is the fatal error. The `start` script in `package.json` is defined as `parcel index.html`. When `npm` tried to run this command, the operating system could not find the `parcel` program. This is because `parcel` is a dependency that should have been installed into the `node_modules` folder. **In short, the problem is that the project's dependencies were not installed before you tried to run the application.** ### **Solution: The Correct Steps** You simply missed one crucial command. Here is the correct sequence to get the simulation running: 1. **Navigate to the directory** (You've already done this): ```bash cd mvu1-sim ``` 2. **Install the dependencies** (This is the missing step): ```bash npm install ``` This command reads your `package.json` file, downloads all the necessary libraries (`parcel`, `typescript`, `graphology`, `sigma`, `chart.js`, etc.) from the internet, and saves them into a new folder called `node_modules` inside your project. 3. **Run the application** (This will work now): ```bash npm start ``` After running `npm install`, the `parcel` command will be available to your script, and the development server will start correctly. You can then navigate to `http://localhost:1234` in your browser to see and use the simulation.