The project seems to require yarn but it's not installed.

To install Yarn on your machine, you can follow these steps:

1. Open your terminal or command prompt.
2. Check if Node.js is installed on your machine by typing `node -v` in the terminal. If it's installed, you should see the version number. If not, you can download and install Node.js from the official website: https://nodejs.org/en/download/
3. Once you have Node.js installed, you can install Yarn by running the following command in the terminal:

   npm install -g yarn

4. Wait for the installation to complete.
5. Once the installation is complete, you can check that Yarn is installed by typing `yarn -v` in the terminal. If you see the version number, then Yarn is installed and ready to use.

After installing Yarn, you can navigate to your project directory and run `yarn` to install all the required dependencies for your project.