RunTime Error : Unexpected Token ILLEGAL in Stack :Unexpected token illegal

Hello all, am facing one problem while performing " Ionic 3 Angular 4 PHP Token Based Restful API User Authentication Login and Signup."

Problem : When am testing my code in Browser it works welled But when Am testing my application in Ionic DevApp … It gives me this syntex error :"Unexpected Token Illegal "

also when am generating .apk file for my application it displaying White screen only and my content of my application are not displaying … please help me to resolve above error

databse Use : Mysql

my ionic info

@ionic/cli-utils : 1.19.1
ionic (Ionic CLI) : 3.19.1

global packages:

cordova (Cordova CLI) : 8.0.0

local packages:

@ionic/app-scripts : 3.1.0
Cordova Platforms  : android 7.0.0
Ionic Framework    : ionic-angular 3.9.2


Android SDK Tools : 26.1.1
Node              : v8.9.4
npm               : 5.6.0
OS                : Windows 10

Environment Variables:

ANDROID_HOME : C:\Users\umesh\AppData\Local\Android\Sdk


backend : pro

please help me

No one have solution for this ??