Clash Royale CLAN TAG#URR8PPP

ScrollView can host only one direct child?

As you can see, my scrollview doesn't have anything inside of it. I am trying to add a relativelayout so I can place switches inside the scroll view. I do not have any other code pertaining to scroll view as of now. Does anyone know why I am getting this error? Error: ScrollView can host only one direct child?

Here is the xml code:

<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/ScrollView01"
android:layout_width="260dp"
android:layout_height="120dp"
android:background="@android:color/black"
android:scrollbarSize="5dp">
</ScrollView>


Here is the java code:

SV = menuView.findViewById(R.id.ScrollView01);

final RelativeLayout RL2 = new RelativeLayout(this);
RelativeLayout.LayoutParams layoutParams2 = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
RL2.setLayoutParams(layoutParams2);

if(SV !=null)
SV.addView(RL2);



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