[android] Upload failed You need to use a different version code for your APK because you already have one with version code 2

Just as Martin Konecny's answer said, you need to change the versionCode to something higher.

Your previous version code was 28. it should be changed to 29.

According to the document on the android developer website. a version code is

An integer value that represents the version of the application code, relative to other versions.

So it should be related(by related I mean higher) to the previous versionCode as noted by the document:

you should make sure that each successive release of your application uses a greater value.

As mentioned again in the document

the android:versionCode value does not necessarily have a strong resemblance to the application release version that is visible to the user (see android:versionName, below)

So even though this is the release 2.0001 of your app, it does not necessarily mean that the versionCode is 2.

Hope this helps :)