Configuration with name 'compileClasspath' not found

[dhvl05]

I'm having so much trouble with this error, I've tried AndroidX Compatibility Guide but no luck :( I also tried changing gradle versions and onesignal-gradle-plugin versions but still not getting over and OneSignal Dashboard is giving me Missing Android Support Library error.

This is what my mainTemplate.gradle look like

buildscript {
    repositories {
        maven { url 'https://plugins.gradle.org/m2/'}
    }
    dependencies {
        classpath 'gradle.plugin.com.onesignal:onesignal-gradle-plugin:[0.12.6, 0.99.99]'
    }
}
apply plugin: 'com.onesignal.androidsdk.onesignal-gradle-plugin'

repositories {
    maven { url 'https://maven.google.com' }
}

buildscript {
    repositories {
        mavenCentral()
        google()
        jcenter()
    }

    dependencies {
        classpath 'com.android.tools.build:gradle:3.4.0'
**BUILD_SCRIPT_DEPS**}
}

allprojects {
    repositories {
        mavenCentral()
        google()
        jcenter()
        flatDir {
            dirs 'libs'
        }
    }
}

// Android Resolver Repos Start
([rootProject] + (rootProject.subprojects as List)).each {
    ext {
        it.setProperty("android.useAndroidX", true)
        it.setProperty("android.enableJetifier", true)
    }
}
([rootProject] + (rootProject.subprojects as List)).each { project ->
    project.repositories {
        def unityProjectPath = $/file:///**DIR_UNITYPROJECT**/$.replace("\\", "/")
        maven {
            url "https://maven.google.com"
        }
        mavenLocal()
        jcenter()
        mavenCentral()
    }
}
// Android Resolver Repos End
apply plugin: 'com.android.library'
**APPLY_PLUGINS**

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
// Android Resolver Dependencies Start
    implementation 'com.android.support:appcompat-v7:25.3.1' // Facebook.Unity.Editor.AndroidSupportLibraryResolver.addSupportLibraryDependency
    implementation 'com.android.support:cardview-v7:[26.0.0, 27.2.0[' // Assets/OneSignal/Editor/OneSignalDependencies.xml:7
    implementation 'com.android.support:cardview-v7:25.3.1' // Facebook.Unity.Editor.AndroidSupportLibraryResolver.addSupportLibraryDependency
    implementation 'com.android.support:customtabs:[26.0.0, 27.2.0[' // Assets/OneSignal/Editor/OneSignalDependencies.xml:8
    implementation 'com.android.support:customtabs:25.3.1' // Facebook.Unity.Editor.AndroidSupportLibraryResolver.addSupportLibraryDependency
    implementation 'com.android.support:support-v4:[26.0.0, 27.2.0[' // Assets/OneSignal/Editor/OneSignalDependencies.xml:6
    implementation 'com.android.support:support-v4:25.3.1' // Facebook.Unity.Editor.AndroidSupportLibraryResolver.addSupportLibraryDependency
    implementation 'com.facebook.android:facebook-applinks:[5,6)' // Assets/FacebookSDK/Plugins/Editor/Dependencies.xml:6
    implementation 'com.facebook.android:facebook-core:[5,6)' // Assets/FacebookSDK/Plugins/Editor/Dependencies.xml:5
    implementation 'com.facebook.android:facebook-login:[5,6)' // Assets/FacebookSDK/Plugins/Editor/Dependencies.xml:7
    implementation 'com.facebook.android:facebook-share:[5,6)' // Assets/FacebookSDK/Plugins/Editor/Dependencies.xml:8
    implementation 'com.google.android.gms:play-services-base:[10.2.1, 12.1.0[' // Assets/OneSignal/Editor/OneSignalDependencies.xml:3
    implementation 'com.google.android.gms:play-services-location:[10.2.1, 12.1.0[' // Assets/OneSignal/Editor/OneSignalDependencies.xml:5
    implementation 'com.google.firebase:firebase-messaging:[10.2.1, 12.1.0[' // Assets/OneSignal/Editor/OneSignalDependencies.xml:4
    implementation 'com.parse.bolts:bolts-android:1.4.0' // Assets/FacebookSDK/Plugins/Editor/Dependencies.xml:4
// Android Resolver Dependencies End
**DEPS**}

// Android Resolver Exclusions Start
android {
  packagingOptions {
      exclude ('/lib/armeabi/*' + '*')
      exclude ('/lib/mips/*' + '*')
      exclude ('/lib/mips64/*' + '*')
      exclude ('/lib/x86/*' + '*')
      exclude ('/lib/x86_64/*' + '*')
  }
}
// Android Resolver Exclusions End
android {
    compileSdkVersion **APIVERSION**
    buildToolsVersion '**BUILDTOOLS**'

    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }

    defaultConfig {
        minSdkVersion **MINSDKVERSION**
        targetSdkVersion **TARGETSDKVERSION**
        ndk {
            abiFilters **ABIFILTERS**
        }
        versionCode **VERSIONCODE**
        versionName '**VERSIONNAME**'
        consumerProguardFiles 'proguard-unity.txt'**USER_PROGUARD**
    }

    lintOptions {
        abortOnError false
    }

    aaptOptions {
        ignoreAssetsPattern = "!.svn:!.git:!.ds_store:!*.scc:.*:!CVS:!thumbs.db:!picasa.ini:!*~"
    }**PACKAGING_OPTIONS**
}**REPOSITORIES****SOURCE_BUILD_SETUP**
**EXTERNAL_SOURCES**

[jkasten2]

@dhvl05 Thanks for reporting. This is the same issue as #248 so please follow that issue for updates on this Unity 2019.3 issue.

[profimedica]

configurations {
    compileClasspath
}
buildscript {
    repositories {
        ...
    }

    dependencies {
        ...
    }
}

[yuk121]

configurations {
    compileClasspath
}
buildscript {
    repositories {
        ...
    }

    dependencies {
        ...
    }
}

It works for me! thanks