在Android Studio上构建android webrtc失败

Question

我做了以下手册： https://webrtc.org/native-code/android/ 我的主要buid.gradle：

    buildscript {
    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath "com.android.tools.build:gradle:3.2.0-beta02"
    }
}

allprojects {
    repositories {
        google()
        jcenter()
    }
}

错误是：

org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':build.android.buildhooks.build_hooks_android_java:compileDebugJavaWithJavac'.
at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:103)
at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:73)
at org.gradle.api.internal.tasks.execution.OutputDirectoryCreatingTaskExecuter.execute(OutputDirectoryCreatingTaskExecuter.java:51)