使用flutter build apk 打包APK，得到一下错误信息，如何解决？
Exception in thread "main" java.lang.NullPointerException: Cannot invoke "String.lastIndexOf(String)" because "path" is null
at org.gradle.wrapper.PathAssembler.getDistName(PathAssembler.java:84)
at org.gradle.wrapper.PathAssembler.getDistribution(PathAssembler.java:40)
at org.gradle.wrapper.Install.createDist(Install.java:44)
at org.gradle.wrapper.WrapperExecutor.execute(WrapperExecutor.java:128)
at org.gradle.wrapper.GradleWrapperMain.main(GradleWrapperMain.java:61)
Error: Gradle task assembleDebug failed with exit code 1