Why my data-binding annotation(@BindingAdapter("imageURL")) doesn't work?

Question

I've written my custom recyclerView and have got a problem. But when I wrote an annotation to mark a setter for my imageView I got a compilation error. Here are the source code and errors.

Error:
Cannot find a setter for <com.makeramen.roundedimageview.RoundedImageView app:imageURL> that accepts parameter type 'java.lang.String'
If a binding adapter provides the setter, check that the adapter is annotated correctly and that the parameter type matches.

Setter code:

import android.widget.ImageView
import androidx.databinding.BindingAdapter
import com.squareup.picasso.Callback
import com.squareup.picasso.Picasso
import java.lang.Exception

class BindingAdapters {
    @BindingAdapter("imageURL")//compilation error
    fun setImageURL(imageView: ImageView, URL: String?) {
        imageView.alpha = 0f
        try {
            Picasso.get().load(URL).noFade().into(imageView, object : Callback {
                override fun onSuccess() {
                    imageView.animate().setDuration(300).alpha(1f).start()
                }
                override fun onError(e: Exception) {
                }
            })
        } catch (ignored: Exception) {
        }

    }
}

ImageView xml code:

 <data>

        <variable
            name="eventShow"
            type="course.ru.qsearcher.models.Event" />
    </data>
........
 <com.makeramen.roundedimageview.RoundedImageView
            android:id="@+id/imageEvent"
            android:layout_width="@dimen/_70sdp"
            android:layout_height="@dimen/_100sdp"
            android:layout_marginStart="@dimen/_10sdp"
            app:imageURL="@{eventShow.imagePath}"
            android:scaleType="centerCrop"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:riv_corner_radius="@dimen/_4sdp" />

Event is a data class with some fields like the title of an event, description, image URL, and so on.

сode

xml usage

url-field

Answer 1

I didn't add the Kotlin plugin to my gradle file

apply plugin: "kotlin-kapt"

That solved my problem