Ionic serve failing to run

Hie guys,

I’m a newbie to ionic. I’ve just bought a ionic template which is version 3.3.0-beta7 and my ionic version which is installed is version 3.3.0.
What happens is if i run ionic serve or ionic info i get the following prompt below:

Looks like this is an angular project, would you like to install @ionic/cli-plugin-angular and continue? (Y/n)
The challenge is when i say “Yes” it either hangs or throws the error message below.

Please help