Unhandled Promise Rejection Warning while adding the plugin

Ionic Framework ionic-v3
1

I am getting this error while adding the plugin to project
(node:5052) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejec
tion id: 1): Error: cmd: Command failed with exit code ENOENT

This is my IONIC Info

cli packages: (C:\Users\CSTPL-107\AppData\Roaming\npm\node_modules)

@ionic/cli-utils  : 1.19.2
ionic (Ionic CLI) : 3.20.0

global packages:

cordova (Cordova CLI) : 8.0.0

local packages:

@ionic/app-scripts : 3.1.10
Cordova Platforms  : none
Ionic Framework    : ionic-angular 3.9.2

System:

Node : v6.11.3
npm  : 3.10.10
OS   : Windows 7

Environment Variables:

ANDROID_HOME : C:\Users\CSTPL-107\AppData\Local\Android\Sdk\

Misc:

backend : pro