compileDebugJavaWithJavac: FAILED - Appflow

Can’t build android applications, fail on the task: capacitor-android: compileDebugJavaWithJavac.

Versions:

Capacitor v3.2.2
Gradle v7.0
Android Gradle Plugin v4.2.0

build.gradle:

buildscript {

    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:4.2.0'
        classpath 'com.google.gms:google-services:4.3.10'
    }
}

apply from: "variables.gradle"

allprojects {
    repositories {
        google()
        jcenter()
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

variables.gradle:

ext {
    minSdkVersion = 21
    compileSdkVersion = 30
    targetSdkVersion = 30
    androidxActivityVersion = '1.2.0'
    androidxAppCompatVersion = '1.2.0'
    androidxCoordinatorLayoutVersion = '1.1.0'
    androidxCoreVersion = '1.3.2'
    androidxFragmentVersion = '1.3.0'
    junitVersion = '4.13.2'
    androidxJunitVersion = '1.1.3'
    androidxEspressoCoreVersion = '3.4.0'
    cordovaAndroidVersion = '7.0.0'
}

can you share the whole error message? gradle usually tells you what class/code failed to compile…