Android Studio 3.1.1 打Jar包出現AGPBI異常

今天，寫好Demo興致勃勃準備打個Jar包在Unity中測試下，不料，突然出現AGPBI這個異常，日誌如下：

AGPBI: {"kind":"error","text":"Program type already present: android.support.v4.app.BackStackRecord$Op","sources":[{}],"tool":"D8"}

:app:transformClassesWithDexBuilderForDebug UP-TO-DATE
AGPBI: {"kind":"error","text":"Program type already present: android.support.v4.app.BackStackRecord$Op","sources":[{}],"tool":"D8"}
:app:transformDexArchiveWithExternalLibsDexMergerForDebug FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:transformDexArchiveWithExternalLibsDexMergerForDebug'.
> com.android.builder.dexing.DexArchiveMergerException: Error while merging dex archives: E:AiYouDemoUcenterSdkTestappbuildintermediatestransformsdexBuilderdebug