Unresolved class in the Android Manifest

[Pipodi]

While adding:

<activity android:name="net.rdrei.android.dirchooser.DirectoryChooserActivity" /> in the AndroidManifest.xml I'm getting:

Unresolved class 'DirectoryChooserActivity'

I've added this in my Gradle script:

maven { url 'https://guardian.github.io/maven/repo-releases/' } under repositories;
implementation 'net.rdrei.android.dirchooser:library:3.2' implementation 'com.gu:option:1.3' under dependencies.

Is that a bug or am I missing something? I'm refactoring an old project of mine, so I'm updating all the libraries.

[passy]

First time I hear about this and this hasn't changed in a long time. Could you provide a sample project so I can repro this?

[Pipodi]

I tried creating a new project, it works out of the box, so it's related to my project. I started re-developing Android application now after a long period, so maybe I'm missing something in order to update my project correctly.