powershell – Error with React native when trying to start App

I’m following the steps provided on the Official Site to set up the environment for React Native.
I have installed create-react-native-app as well as expo-cli .
Further i created an app using expo init.
Now when I’m trying to run the app with yarn start or npm start I get the following error:

Error: spawn powershell ENOENT
    at Process.ChildProcess._handle.onexit (internal/child_process.js:240:19)
    at onErrorNT (internal/child_process.js:415:16)
    at process._tickCallback (internal/process/next_tick.js:63:19)
error Command failed with exit code 1.

How do i solve it? is that something related to powershell?

P.S. I’m using Windows 8, Expo 3.24.2, yarn 1.22.4, node 10.15.3