Cannot invoke method close() on

Task failed with an exception.
-----------
* What went wrong:
Execution failed for task ':app.doubler:transformClassesWith___ReClass___ForDebug'.
> Cannot invoke method close() on null object

这是 gradle 编译失败报的错, 将app 目录中的 build 文件删除,重新编译就好了
原因: 可能是 build 有缓存,导致编译失败