Throw an exception when open a gradle application by Idea

I'm a newer to `gradle`,and when i open a `gradle` application with `idea`,Then it throw an error `Gradle 3.1 requires Java 7 or later to run. Your build is currently configured to use Java 6`. My `gradle` info: Gradle 3.1 Build time: 2016-09-19 10:53:53 UTC Revision: 13f38ba699afd86d7cdc4ed8fd7dd3960c0b1f97 Groovy: 2.4.7 Ant: Apache Ant(TM) version 1.9.6 compiled on June 29 2015 JVM: 1.8.0_60 (Oracle Corporation 25.60-b23) OS: Mac OS X 10.11.6 x86_64 idea error idea setting file -> other settings -> default project setting EIDT Log ``` 2016-10-30 14:25:06,941 [1651420] INFO - .BaseProjectImportErrorHandler - Failed to import Gradle project at '/Users/famoss/Downloads/btrace-master/gradle' org.gradle.tooling.GradleConnectionException: Could not create an instance of Tooling API implementation using the specified Gradle installation '/Users/famoss/Downloads/gradle-3.1'. Caused by: org.gradle.internal.jvm.UnsupportedJavaRuntimeException: Gradle 3.1 requires Java 7 or later to run. You are currently using Java 6. ```