Can't use custom attributes in XML

[loeschg]

I have the following layout

   <RelativeLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:id="@+id/container"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@color/background_gray"
        android:focusableInTouchMode="true"
        >
                <it.sephiroth.android.library.widget.HListView
                    android:id="@+id/storefront_gallery_list"
                    android:layout_width="match_parent"
                    android:layout_height="@dimen/gallery_image_side"
                    android:divider="@android:color/transparent"
                    app:dividerWidth="@dimen/spacing_normal"
                    android:paddingTop="@dimen/spacing_normal"
                    android:background="@color/background_gray"
                    />
    </RelativeLayout>

I'm no longer able to compile this. I get the following Gradle error:

Output:
/Users/user/dev/mobile/test-project/TestProj/build/res/all/debug/layout/activity_test.xml:123: error: No resource identifier found for attribute 'dividerWidth' in package 'com.test.testproj'

There seems to be an issue with

app:dividerWidth="@dimen/spacing_normal"

and

xmlns:app="http://schemas.android.com/apk/res-auto"

Should I be including that a different way? I ended up having to programmatically set the dividerWidth attribute. This started happening not too long ago. I had to clean my gradle cache ~/.gradle and maven cache ~/.m2 for it to manifest itself on my local machine in case that's of relevance.

[sephiroth74]

the attributes have changed. check the hlv_attrs for the complete list