我已经在一个项目上工作了6个月，今天突然当我打开m android studio并想开始调试我的android应用程序时，我得到了一个我从未见过的错误。我搜索了一下，发现问题出在Gradle版本和Jave版本上，但都是最新的。我在网上搜索解决方案，但没有找到任何东西。请帮助（idk如果这是连接，但最后一次它的工作是一个正确的之前，我安装git）
这里是错误：

Launching lib\main.dart on sdk gphone64 x86 64 in debug mode...
Running Gradle task 'assembleDebug'...

FAILURE: Build failed with an exception.

* Where:
Build file 'E:\downloads\Welcome-Login-Signup-Page-Flutter-master\Welcome-Login-Signup-Page-Flutter-master\android\build.gradle'

* What went wrong:
Could not compile build file 'E:\downloads\Welcome-Login-Signup-Page-Flutter-master\Welcome-Login-Signup-Page-Flutter-master\android\build.gradle'.
> startup failed:
  General error during conversion: Unsupported class file major version 64

  java.lang.IllegalArgumentException: Unsupported class file major version 64
    at groovyjarjarasm.asm.ClassReader.<init>(ClassReader.java:189)
    at groovyjarjarasm.asm.ClassReader.<init>(ClassReader.java:170)
    at groovyjarjarasm.asm.ClassReader.<init>(ClassReader.java:156)
    at groovyjarjarasm.asm.ClassReader.<init>(ClassReader.java:277)
    at org.codehaus.groovy.ast.decompiled.AsmDecompiler.parseClass(AsmDecompiler.java:81)
    at org.codehaus.groovy.control.ClassNodeResolver.findDecompiled(ClassNodeResolver.java:251)

  1 error

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 1s
Exception: Gradle task assembleDebug failed with exit code 1

我试图通过android studio构建一个android应用程序，我得到了一个错误