Application error the connection to the server was unsuccessful

Ionic Framework ionic-v3
1

I published an application on Ionic2 but I have a device connection that displays this message.

Application Error
The connection to the server was unsuccessful. (File: ///android_asset/www/index.html)

I saw on the internet some posts to solve but without success, what can be?

2

Are you getting this error when you run ionic run andoird ?? if so please read

go to adb manager folder and open command prompt there
adb kill-server
adb start-server

this should restart adb manager and try ionic run android again

3

No, I generated an APK in production with the command ‘ionic build android --release’, copied to my SD card and installed, after running the app without internet I get this message

4

did it run okay when you ran it on a simulator or your device

5

It works in debug mode and in production with internet, but if disable the internet the device does not work in any environment

6

Resolved

In my index.html I removed the link '<script src = "http://maps.googleapis.com/maps/api/js?sensor=false"> </ script>' and in my config.xml file I added ' < preference name = "loadUrlTimeoutValue" value = "700000" /> '

Thank you for trying to help

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