titan - Titan-all gradle プルが失敗する

Question

私は最新のタイタンを引っ張っています[Windowsとubuntuで]

compile group: 'com.thinkaurelius.titan', name:'titan-all', version:'0.4.0'

次のエラーが表示されます。

Download http://repo1.maven.org/maven2/org/slf4j/slf4j-log4j12/1.7.5/slf4j-log4j12-1.7.5.jar

FAILURE: Build failed with an exception.

* What went wrong:
Could not resolve all dependencies for configuration ':runtime'.
> Could not download artifact 'com.thinkaurelius.titan:titan-core:0.4.0:${titan.classifier}@jar'
> java.lang.NullPointerException (no error message)
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

助けてくれてありがとう。