Login not working in ionic view app, but it works fine in my local machine

In my ionic app, I have a login form. It works fine when I run it on my PC. But once after I pushed to dashboard, login isn’t working in ionic view app. I am not knowing what is the error even. In ionic dev app, login throws ‘Run time error’.
App id - 4ed27d48

Ionic info
cli packages: (C:\Users\kishore\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 : 3.1.8
Cordova Platforms  : android 6.4.0
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\kishore\AppData\Local\Android\Sdk


backend : pro