<Android + Kotlin + Hilt: Error building project> ...

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[user]

Android + Kotlin + Hilt: Error building project
I'm new to Hilt, and I'm struggling my head in order to implement it in my multi-module app. After infinite attempts the build error varies from "error a" to "error b", then "error c" and so.
This is how I've started implementing Hilt into my multi-module app:
Project build.gradle:

buildscript {
ext.kotlin_version = '1.7.10'
repositories {
jcenter()
google()
}
dependencies {
classpath 'com.android.tools.buildG7.2.1'
classpath...