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 :)