To solve that :
you_app_folder/plugin and look for plugin.xml in all the plugins
Go to your plugin folder, search in that directory for :
com.android.support:support-v4:+
OR
com.android.support:support-v4:24.1.1+
OR
com.android.support:appcompat-v7:28.0.0
Change it with :
com.android.support:support-v4:27.1.0
OR
com.android.support:appcompat-v7:27.1.1
then
Also, I executed
ionic cordova platform remove android
and
ionic cordova platform add android
