Android gives error “Cannot fit requested classes in a single dex file”

In root build.gradle file do something like:

dependencies {

    // ...

    implementation 'androidx.multidex:multidex:2.0.1'
}

android {
    defaultConfig {

        // ...

        multiDexEnabled true
    }
}

More details here: Error:Cannot fit requested classes in a single dex file.Try supplying a main-dex list. # methods: 72477 > 65536