Ionic android app crashes

I am having a weird situation when trying to build ionic android app.

Everything was working fine, then suddenly this happened, now my app no more running in android, how ever its working fine in ionic lab view in browser.

i have run cmd

adb logcat

following is the snap of output

Edit OutPut, I am not getting what went wrong

06-17 16:16:25.752 D/SystemWebViewEngine(27783): CordovaWebView is running on device made by: samsung
06-17 16:16:25.757 W/art     (27783): Attempt to remove local handle scope entry from IRT, ignoring
06-17 16:16:25.757 W/art     (27783): Attempt to remove local handle scope entry from IRT, ignoring
06-17 16:16:25.782 D/AndroidRuntime(27783): Shutting down VM
06-17 16:16:25.782 E/AndroidRuntime(27783): FATAL EXCEPTION: main
06-17 16:16:25.782 E/AndroidRuntime(27783): Process: com.ionicframework.wasupcrowd708245, PID: 27783
06-17 16:16:25.782 E/AndroidRuntime(27783): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.ionicframework.wasupcrowd708245/com.ionicframework.wasupcrowd708245.MainActivity}: java.lang.NullPointerException: Argument 'context' cannot be null