Flow was not found when attempting to start

I am working on react-native application for which I am using Atom IDE. I am getting an error on opening Atom

I installed babel-cli and babel-preset-flow with npm command.

npm install --save-dev babel-cli babel-preset-flow

Now when I restart Atom then it shows same warning to me "Flow was not found when attempting to start". Can anyone help me how to fix it probably it is because of PATH. I do not know how I can set PATH of npm package.

via Williams