将Android Studio更新为1.5后出现Gradle错误

今天我已将Android Studio更新为v1.5.我有libgdx项目,在此更新之前运行良好.现在我收到此错误消息.

    Error:Unable to load class 'org.gradle.mvn3.org.sonatype.aether.resolution.ArtifactResolutionException'.
Possible causes for this unexpected error include:
Gradle's dependency cache may be corrupt (this sometimes occurs after a network connection timeout.)
Re-download dependencies and sync project (requires network)
The state of a Gradle build process (daemon) may be corrupt. Stopping all Gradle daemons may solve this problem.
Stop Gradle build processes (requires restart)
Your project may be using a third-party plugin which is not compatible with the other plugins in the project or the version of Gradle requested by the project.
In the case of corrupt Gradle processes, you can also try closing the IDE and then killing all Java processes.

我尝试删除.gradle文件夹,重启Android Studio,清理项目,但我得到了同样的错误.

感谢帮助

我只需要在主gradle文件中更新gradle构建工具

    classpath 'com.android.tools.build:gradle:1.3.0'
    classpath 'org.robovm:robovm-gradle-plugin:1.0.0-beta-04'

至:

    classpath 'com.android.tools.build:gradle:1.2.3'
    classpath 'org.robovm:robovm-gradle-plugin:1.9.0'