最近从Eclipse ADT迁移（或者仍在尝试）到Android Studio，这就是Gradle在我点击“运行”时所说的内容。 （以下全文）：
* What went wrong: Execution failed for task ':app:packageDebug'. > class org.bouncycastle.asn1.ASN1Primitive overrides final method equals.(Ljava/lang/Object;)Z
我已经看到：Android Studio Bouncy castle issue (newbie)，Problems launching error in Android Studio when packageDebug at Max OS X和类似的SO帖子都指向应该从类路径中删除的充气城堡JAR（bcprov-jdk15on-1.48.jar）。但是我没有这样的JAR文件，事实上，Gradle本身似乎下载了它，因为我发现它的唯一地方是：
/Applications/Android Studio.app/Contents/gradle/m2repository/org/bouncycastle/bcprov-jdk15on/
试图删除那里的文件，Gradle抱怨缺少引用的库。
我该如何解决这个问题？
完整追踪：
Executing tasks: [:app:assembleDebug]
Configuration on demand is an incubating feature.
:app:preBuild UP-TO-DATE
:app:preDebugBuild UP-TO-DATE
:app:checkDebugManifest
:app:preDebugAndroidTestBuild UP-TO-DATE
:app:preReleaseBuild UP-TO-DATE
:app:prepareComAndroidSupportMultidex101Library UP-TO-DATE
:app:prepareDebugDependencies
:app:compileDebugAidl UP-TO-DATE
:app:compileDebugRenderscript UP-TO-DATE
:app:generateDebugBuildConfig UP-TO-DATE
:app:generateDebugAssets UP-TO-DATE
:app:mergeDebugAssets UP-TO-DATE
:app:generateDebugResValues UP-TO-DATE
:app:generateDebugResources UP-TO-DATE
:app:mergeDebugResources UP-TO-DATE
:app:processDebugManifest UP-TO-DATE
:app:processDebugResources UP-TO-DATE
:app:generateDebugSources UP-TO-DATE
:app:compileDebugJavaWithJavac UP-TO-DATE
:app:compileDebugNdk UP-TO-DATE
:app:compileDebugSources UP-TO-DATE
:app:transformClassesWithJarMergingForDebug UP-TO-DATE
:app:collectDebugMultiDexComponents
:app:transformClassesWithMultidexlistForDebug UP-TO-DATE
:app:transformClassesWithDexForDebug UP-TO-DATE
:app:mergeDebugJniLibFolders UP-TO-DATE
:app:transformNative_libsWithMergeJniLibsForDebug UP-TO-DATE
:app:processDebugJavaRes UP-TO-DATE
:app:transformResourcesWithMergeJavaResForDebug UP-TO-DATE
:app:validateDebugSigning
:app:packageDebug FAILED
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':app:packageDebug'.
> class org.bouncycastle.asn1.ASN1Primitive overrides final method equals.(Ljava/lang/Object;)Z
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.
BUILD FAILED
Total time: 0.479 secs