Gradle fails to setup a workspace

I get the following error when trying to run with GradleForge (for Minecraft modding)

Exception: org.gradle.listener.ListenerNotificationException thrown from the Unc
aughtExceptionHandler in thread "main"

I’d be using Eclipse with JDK 1.7_40 on Windows 7 64-bit OS.

Best ask the authors of that build (and add more information).