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Unable to add dependency: Failed to resolve: androidx.lifecycle:lifecycle-extensions:2.2.0-rc2

I am trying to add few dependencies to my Android project but I'm still getting some weird errors. I am trying to add recommended dependencies which I've found on CodeLabs but it steel does not allow me to sync my gradle files successfully.

The error that is keep showing up is the following: ERROR: Failed to resolve: androidx.lifecycle:lifecycle-extensions:2.2.0-rc2

Code: inside gradle module

// Room components
implementation "androidx.room:room-runtime:$rootProject.roomVersion"
annotationProcessor "androidx.room:room-compiler:$rootProject.roomVersion"
androidTestImplementation "androidx.room:room-testing:$rootProject.roomVersion"
    // Lifecycle components
    implementation "androidx.lifecycle:lifecycle-extensions:$rootProject.archLifecycleVersion"
    annotationProcessor "androidx.lifecycle:lifecycle-compiler:$rootProject.archLifecycleVersion"
    // UI
    implementation "com.google.android.material:material:$rootProject.materialVersion"
    // Testing
    androidTestImplementation "androidx.arch.core:core-testing:$rootProject.coreTestingVersion"
Text inside gradle project:
 ext {
    roomVersion = '2.2.1'
    archLifecycleVersion = '2.2.0-rc2'
    coreTestingVersion = '2.1.0'
    materialVersion = '1.0.0'
This is also one error that I am getting sometimes, it appears randomly...
 ERROR: Manifest merger failed : Attribute application@appComponentFactory value=(android.support.v4.app.CoreComponentFactory) from [com.android.support:support-compat:28.0.0] AndroidManifest.xml:22:18-91
    is also present at [androidx.core:core:1.1.0] AndroidManifest.xml:24:18-86 value=(androidx.core.app.CoreComponentFactory).
    Suggestion: add 'tools:replace="android:appComponentFactory"' to <application> element at AndroidManifest.xml:11:5-28:19 to override.
The error log literally says there is no androidx.lifecycle:lifecycle-extensions version 2.2.0-rc2.
Change archLifecycleVersion = '2.2.0-rc2' to archLifecycleVersion = '2.2.0-rc02' to fix that error.
The APIs in lifecycle-extensions have been deprecated. Instead, add dependencies for the specific Lifecycle artifacts you need.
dependencies {
    def lifecycle_version = "2.2.0"
    def arch_version = "2.1.0"
    // ViewModel
    implementation "androidx.lifecycle:lifecycle-viewmodel-ktx:$lifecycle_version"
    // LiveData
    implementation "androidx.lifecycle:lifecycle-livedata-ktx:$lifecycle_version"
    // Lifecycles only (without ViewModel or LiveData)
    implementation "androidx.lifecycle:lifecycle-runtime-ktx:$lifecycle_version"
    // Saved state module for ViewModel
    implementation "androidx.lifecycle:lifecycle-viewmodel-savedstate:$lifecycle_version"
    // Annotation processor
    kapt "androidx.lifecycle:lifecycle-compiler:$lifecycle_version"
    // alternately - if using Java8, use the following instead of lifecycle-compiler
    implementation "androidx.lifecycle:lifecycle-common-java8:$lifecycle_version"
    // optional - helpers for implementing LifecycleOwner in a Service
    implementation "androidx.lifecycle:lifecycle-service:$lifecycle_version"
    // optional - ProcessLifecycleOwner provides a lifecycle for the whole application process
    implementation "androidx.lifecycle:lifecycle-process:$lifecycle_version"
    // optional - ReactiveStreams support for LiveData
    implementation "androidx.lifecycle:lifecycle-reactivestreams-ktx:$lifecycle_version"
    // optional - Test helpers for LiveData
    testImplementation "androidx.arch.core:core-testing:$arch_version"
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