Yarn ERROR: There are no scenarios; must have at least one

# Yarn ERROR: There are no scenarios; must have at least one

The Yarn error "There are no scenarios; must have at least one" occurs when you use the yarn command from the cmdtest package.

To solve the error, uninstall cmdtest and add the yarn repository.

The cmdtest command is used to test non-interactive Unix command line tools.

You don't need to have the command installed, so you can uninstall it because it shadows yarn.

Open your terminal and run the following commands to uninstall cmdtest and install yarn correctly.

Copied!
# Uninstall cmdtest
sudo apt remove cmdtest

# Uninstall yarn
sudo apt remove yarn

# Make sure curl is installed
sudo apt install curl

# Add yarn repository
curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | sudo apt-key add -
echo "deb https://dl.yarnpkg.com/debian/ stable main" | sudo tee /etc/apt/sources.list.d/yarn.list

# Install yarn
sudo apt update
sudo apt install yarn

Make sure to add the yarn repository before you run the sudo apt install yarn command.

If the Debian-specific installation command fails, try to install yarn using npm.

Copied!
npm install --global yarn

If that didn't work either, try running the following commands.

Copied!
sudo apt remove cmdtest

sudo apt install npm

sudo npm install --global yarn

I've also written guides on:

• how to install yarn on macOS or Linux
• how to install yarn on Windows

After you run the commands, try to rerun your yarn command.

Copied!
yarn

# or
yarn install

You can also run the yarn install <YOUR_PACKAGE> if you need to install a specific package, e.g. yarn add axios.

Copied!
yarn add <YOUR_PACKAGE>

If you need to install a package as a development dependency, add the --dev flag, e.g. yarn add jest --dev.

Copied!
yarn add <YOUR_PACKAGE> --dev

Make sure your terminal is opened in your project's root directory (where your package.json file is) before running the yarn install commands.

If the yarn --version command runs successfully, then you've installed yarn and not cmdtest

Copied!
yarn --version

If you get a version number back, then the issue is resolved.

# Additional Resources

You can learn more about the related topics by checking out the following tutorials:

• How to force Yarn to reinstall a package [5 Ways]
• How to uninstall YARN on Windows, MacOS and Linux
• Yarn error: Command failed with exit code 127 [Solved]
• YARN: An error occurred during the signature verification