更新到androidstudio4.0.1后舊項目報錯

CONFIGURE SUCCESSFUL in 0s
java.lang.NullPointerException
    in ToolingStreamApiUtils.writeFiles(ToolingStreamApiUtils.java:143)

com.sun.proxy.$Proxy191 cannot be cast to org.jetbrains.plugins.gradle.model.DefaultExternalProject
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.

這是因為使用的classpath版本太低導致

一種方法是升級 

classpath 'com.android.tools.build:gradle:4.0.1'

另一種是刪掉不支持的腳本

//        jackOptions {
//            enabled true
//        }