我使用下面的参考资料克隆了mongo hadoop connector git存储库，
http://docs.mongodb.org/ecosystem/tutorial/getting-started-with-hadoop/
克隆成功后，当我尝试使用$./gradlew jar构建jar时，它显示了以下异常，

hduser@mypc:/mongo-hadoop$ ./gradlew jar
:compileJava
FAILURE: Build failed with an exception.
* What went wrong:
Could not create service of type TaskArtifactStateCacheAccess using    TaskExecutionServices.createCacheAccess().
> Failed to create parent directory '/mongo-hadoop/.gradle' when creating directory '/mongo-hadoop/.gradle/2.2.1/taskArtifacts'
* Try:
Run with --stacktrace option to get the stack trace. Run with --info   or --debug option to get more log output.

生成失败
有什么原因可以帮助我解决这个问题。