According to this answer How to solve "Your APK's version code needs to be higher than 2." in Google Play's Developer Console? I have just changed the vers
I received the same error while uploading a flutter app to playstore simply change the version code in pubspec.yaml worked for me. may be try changing the version code e.g from +1 to +2 and then rebuild the apk using
flutter build apk --split-per-abi
and upload all the apk's to the playstore for your users. Next time when you want to push an update make sure to update the version code to +3 and so on.
Note: that the version code and version name are different you can see that in android/local.properties file. e.g version: 1.0.0+2
version is 1.0.0 and verison code is +2