Steps to reproduce:

1) Download attached project 'ExportGradleFailure.zip' and open in Unity
2) Make sure BuildSystem is set to Gradle(new)
3) Connect any android device to your machine
4) Build and Run project on a device
Build will fail with CommandInvokationFailure

Expected result: Using Gradle Build System should build this project without any failure
Actual result: Build fails with exceptions(check attached error message 'GradleBuildFail.txt')

Reproduced with:
5.6.0b1, 5.6.2p3, 2017.1.0f3, 2017.2.0b3

Using Internal(Default) Build System builds this project without any failure
Note: I wasn't able to start building with 5.5.x due to errors in the Console window