Flutter build error for the first time :Could not open settings remapped class cache for 7yvt6la2007dno98lt3rzbguf

Question

I just downloaded Flutter and tried to learn the emulator with the first default code which Google offered. But it does not run at all!

I have the dart and flutter plugins installed. I also changed the order of jcenter() and google() too

like this:

buildscript {
    ext.kotlin_version = '1.3.50'
    repositories {
        jcenter()
        google()
    }

   
dependencies {
        classpath 'com.android.tools.build:gradle:3.5.0'

        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    }
}

allprojects {
    repositories {
        jcenter()
        google()

    }
}

And the error is:

Launching lib/main.dart on Android SDK built for x86 in debug mode...
Running Gradle task 'assembleDebug'...

FAILURE: Build failed with an exception.

* What went wrong:
Could not open settings remapped class cache for 7yvt6la2007dno98lt3rzbguf (/Users/[myname]/.gradle/caches/5.6.2/scripts-remapped/settings_7iv4l88jiyzeatj2wku74hwcv/7yvt6la2007dno98lt3rzbguf/settings8410a2d21ed2f87c8a0398566330ee52).
> Could not open settings generic class cache for settings file '/Users/[myname]/AndroidStudioProjects/test_app/android/settings.gradle' (/Users/[myname]/.gradle/caches/5.6.2/scripts/7yvt6la2007dno98lt3rzbguf/settings/settings8410a2d21ed2f87c8a0398566330ee52).
   > BUG! exception in phase 'semantic analysis' in source unit '_BuildScript_' Unsupported class file major version 57

* 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 568ms
Finished with error: Gradle task assembleDebug failed with exit code 1

Answer 1

I don't know reason for this error. But I was updated gradle version to the latest in gradle-wrapper.properties file. Then sync. It worked for me.

distributionUrl=https\://services.gradle.org/distributions/gradle-6.7.1-all.zip

Answer 2

You need to update version of Gradle:

1. go to https://gradle.org/install/ and get info about last version (for now it is 7.1.1)
2. open gradle/wrapper/gradle-wrapper.properties and change version to last

distributionUrl=https://services.gradle.org/distributions/gradle-7.1.1-all.zip