Android gradle dynamic VersionCode sync issue

In our project we are trying to add the AppDynamics SDK.

The versionCode will be determined dynamically based on Git.

For example:

http://ryanharter.com/blog/2013/07/30/automatic-versioning-with-git-and-gradle/

But using this way, syncing the gradle file, the AppDynamics plugin adeum will say:

"Error: Cause: adeum: Unable to determine versionode. Have you defined versionCode in your AndroidManifest.xml file?"

This won't be displayed, if we use a static integer as versionCode, instead of dynamically getting from git. 

Is there any solution for this?

Thank you in advance.