Hi Omega,
The code to Android issue for preview 1 is a known issue. For reference, the JIRA number is UE-15001, however I know it has already been fixed and should be integrated by the actual 4.8 release at the very latest. Most likely it will be seen in one of the previews before then however because it is such a wide reaching issue. It should not be anything about the SDK in specific, just that the Apache Ant error seems to show up at unusual times.
Thanks for letting us know!