App crashed while trying to get reference of java class

[deepmashru]

xml code :-
<com.gauravk.audiovisualizer.visualizer.BlastVisualizer
xmlns:custom="http://schemas.android.com/apk/res-auto"
android:id="@+id/wave"
android:layout_width="match_parent"
android:layout_height="70dp"
android:layout_alignParentBottom="true"
custom:avDensity="0.8"
custom:avType="outline"
custom:avColor="@color/av_dark_blue"
custom:avSpeed="normal"/>

java code :-
BarVisualizer barVisualizer;
barVisualizer = findViewById(R.id.wave);

[yasserboutaleb]

Same here!