After adding onesignal plugin cordova build makes error

Hi guys,
help me
how to resolve this following issue…
I simply created the new project and
I build the app using
ionic Cordova build android --prod,
it builds fine without any issue.
but when I add the one signal plugin in my project using

ionic cordova plugin add onesignal-cordova-plugin

npm install --save @ionic-native/onesignal

when again build the application using

ionic Cordova build android --prod

it creates the following error

app:preDebugBuild
FAILED
14 actionable tasks: 1 executed, 13 up-to-date
FAILURE: Build failed with an exception.
*What went wrong:
Could not resolve all files for configuration ‘:app:debugCompileClasspath’.
> Could not find support-v4.aar (com.android.support:support-v4:27.1.1).
Searched in the following locations:
https://jcenter.bintray.com/com/android/support/support-v4/27.1.1/support-v4-27.1.1.aar
*Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log out
put.
*Get more help at https://help.gradle.org
BUILD FAILED in 26s
(node:9756) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 1): Error: cmd: Command failed with exit code 1 Error output:
FAILURE: Build failed with an exception.
*What went wrong:
Could not resolve all files for configuration ‘:app:debugCompileClasspath’.
> Could not find support-v4.aar (com.android.support:support-v4:27.1.1).
Searched in the following locations:
https://jcenter.bintray.com/com/android/support/support-v4/27.1.1/support-v4-27.1.1.aar
*Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log out
put.
*Get more help at https://help.gradle.org
BUILD FAILED in 26s

how to resolve
this issue…

here my project info

`> F:\testing\onesignal> ionic info

cli packages: (C:\Users\master\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 : 3.2.0
Cordova Platforms  : android 7.0.0
Ionic Framework    : ionic-angular 3.9.2

System:

Android SDK Tools : 26.1.1
Node              : v6.11.1
npm               :  6.4.1
OS                : Windows 10

Environment Variables:

ANDROID_HOME : C:\Sdk

Misc:

backend: pro

PS F:\testing\onesignal>`

hi, have you solved the issue? I’m facing same

remove the platform and add it again…

if its fails… uninstall all plugins. first install onesignal and add all your plugins and build it…