Unable to merge dex Ionic 3

Question

Last time I build successfully but after adding the number of pages I am unable to build, I did search for that error a lot but nothing works for me.For example, add

Answer 1

I have the same issue

(Unable to merge dex Ionic)

when I created the Ionic app. When I run the app the

BUILD FAILED in 11s 37 actionable tasks: 3 executed

error occurred. First I use the following solution but it doesn't work for me but it work for the other I guess.

configurations.all {
    resolutionStrategy {
       force 'com.android.support:support-v4:26.1.0'
    } 
}

Finally this is what helped me to overcome the issue of failing to build the app.

cordova clean android
ionic cordova build android
ionic cordova run android (To re-launch the app)