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

[wangfaxi1985]

i want use "yarn " in my npm project
when run shell " yarn " in the shell,
it throw "ERROR: There are no scenarios; must have at least one. "

what problem?

yarn --version
0.27
node -v
v6.9.5
uname -a
Linux wfx-pc 4.4.0-3-deepin-amd64 #1 SMP Deepin 4.4.30-2 (2016-12-01) x86_64 GNU/Linux

[OmerHerera]

@wangfaxi1985, please check again your yarn version, the latest version is 0.21.3 and the tagged version is 0.22.0-0.
Also check that you run yarn command in the folder where your package.jsonis located
Thanks

[Daniel15]

You've got the wrong yarn 😄 The Yarn you're executing comes from the cmdtest package: http://manpages.ubuntu.com/manpages/xenial/man1/yarn.1.html. Uninstalling cmdtest should fix this. Once you've uninstalled it, follow the instructions on https://yarnpkg.com/en/docs/install#linux-tab to add the Yarn repo:

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
sudo apt update
sudo apt install yarn

[becdetat]

cmdtest seems to be installed by default on Ubuntu 17.04 at least, so perhaps this should be added to the installation instructions...

For anyone that finds this, if you're getting an error on sudo apt-get install yarn run sudo apt remove cmdtest first.

[peter-lyons-kehl]

On Ubuntu (at least 17.04), after you sudo apt remove cmdtest, first follow https://yarnpkg.com/en/docs/install#linux-tab > Ubuntu. Only then sudo apt-get install yarn. If you don't follow https://yarnpkg.com/en/docs/install#linux-tab, then running sudo apt-get install yarn will install cmdtest again.

[istals]

On Ubuntu 17.10 I'm not able to install yarn - I removed cmdtest package, but sudo apt-get install yarn reinstall cmdtest.

[yuqingc]

@istals I have the same problem as you do. The cmdtest is still installed even if I remove it firstly. How do I get yarn on Ubuntu 17.10?

[jdorleans]

For Ubuntu 17.10, try the workaround:

sudo apt remove cmdtest
sudo apt install npm
sudo npm install -g yarn

[Daniel15]

For Ubuntu 17.10, you need to add the Yarn repo first.

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
sudo apt update
sudo apt remove cmdtest
sudo apt install yarn

Make sure you remove cmdtest if you have it installed.

Prefer this to installing via npm.

@jdorleans - you don't have to install npm if you're using Yarn :)

[yuqingc]

@jdorleans Thanks for your comment. I have successfully installed yarn by using npm install -g yarn.