Cannot add task ':processArmv8DebugGoogleServices' as a task with that name already exists.

[VinlorJiang]

Below is my ionic info:
`cli packages: (/Users/admin/Documents/BEA APP/copy from FTL/BEA-App-2018 2/CCCDI_FULL_SOURCE/node_modules)

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

global packages:

cordova (Cordova CLI) : 7.1.0 

local packages:

@ionic/app-scripts : 3.1.2
Cordova Platforms  : android 6.2.3 ios 4.4.0
Ionic Framework    : ionic-angular 3.5.3

System:

Node  : v8.13.0
npm   : 6.4.1 
OS    : macOS
Xcode : Xcode 11.3.1 Build version 11C505 

Environment Variables:

ANDROID_HOME : not set

Misc:

backend : pro`

On platform of android show error:" Cannot add task ':processArmv8DebugGoogleServices' as a task with that name already exists. "

Who can give me some advise? Thanks!