Yarn and Nodemon Error in VsCode or PowerShell

Open PowerShell (Run As Administrator)

Check the current execution policy using this command  

      Get-ExecutionPolicy

# You should get 'Restricted'

Run this command to make it 'Unrestricted'

    Set-ExecutionPolicy Unrestricted

Check again whether execution policy changed by running this command

    Get-ExecutionPolicy    

   # You should get     

'Unrestricted'    

Now try to run nodemon , yarn etc