Ошибка C: \ Users \ ZUBAIR \ AndroidStudioProjects \ RadioApp \ app \ src \ main \ res \ layout \ content_full. xml: 125: AAPT: error: '' несовместима с атрибутом layout_constraintHorizont_bias ( attr) float.
<com.google.android.gms.ads.AdView
android:id="@+id/adView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:visibility="visible"
app:adSize="BANNER"
app:adUnitId="@string/banner"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias=""
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/mpv"
app:layout_constraintVertical_bias="1"
tools:visibility="visible"></com.google.android.gms.ads.AdView>
</android.support.constraint.ConstraintLayout>