error: package com.nguyenhoanglam.imagepicker.activity does not exist

Library changed.

In fact I am using Java not Kotlin.

When I look the library, I saw that there is another equivalent library for Java.

https://github.com/esafirm/android-image-picker

This library works without any problem, now. I do not know why the first library is not working.

You can use Android-Image-Cropper which seems very feasible and handy to me.