Ionic app continuously shows white screen on opening

I have developed one ionic app which works fine before June 15,2019. After that it continuously shows white screen after splash.Lazy loading is implemented in app.

I tried below steps for building apk

ionic cordova platform rm android
ionic cordova platform add android@8.0.0 
ionic cordova plugin add cordova-plugin-androidx 
ionic cordova plugin add cordova-plugin-androidx-adapter
cordova plugin add cordova-android-support-gradle-release --save

Terminal log of app on android studio is as below

07-26 12:12:45.241 19749-19799/io.ionic.starter E/libEGL:
validate_display:255 error 3008 (EGL_BAD_DISPLAY) 07-26 12:12:45.521
19749-19782/io.ionic.starter E/AndroidProtocolHandler: Unable to open
asset URL:
file:///android_asset/www/lib/ngCordova/dist/ng-cordova.min.js 07-26
12:12:45.536 19749-19804/io.ionic.starter E/AndroidProtocolHandler:
Unable to open asset URL:
file:///android_asset/www/lib/ion-autocomplete/dist/ion-autocomplete.js
07-26 12:12:45.536 19749-19804/io.ionic.starter
E/AndroidProtocolHandler: Unable to open asset URL:
file:///android_asset/www/lib/ion-autocomplete/dist/ion-autocomplete.css
07-26 12:12:45.541 19749-19782/io.ionic.starter
E/AndroidProtocolHandler: Unable to open asset URL:
file:///android_asset/www/js/Calendar.js 07-26 12:12:50.181
19749-19749/io.ionic.starter E/ViewRootImpl: sendUserActionEvent()
mView == null

Please help me