Adding layout dynamically to ScrollView android

I want to add xml layout dynamically to scrollview in my application, but it is showing an error.

This is my code:

LinearLayout ll = (LinearLayout)findViewById(R.id.myContent1);
    LayoutInflater vi = (LayoutInflater)getSystemService(Context.开发者_如何学CLAYOUT_INFLATER_SERVICE); 
    View vv = vi.inflate(R.layout.headerone, null); 
    ll.addView(vv);//, new LinearLayout.LayoutParams(ll.getLayoutParams().width, ll.getLayoutParams().height));

    View vv2 = vi.inflate(R.layout.headertwo, null); 
    ll.addView(vv2);//, new LinearLayout.LayoutParams(ll.getLayoutParams().width, ll.getLayoutParams().height));

    View vv3 = vi.inflate(R.layout.headerone, null); 
    ll.addView(vv3);

"headerone.xml" and "headertwo.xml" are my two xml layout files.

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Probably

A ScrollView is a FrameLayout, meaning you should place one child in it containing the entire contents to scroll; this child may itself be a layout manager with a complex hierarchy of objects.

But we would need to see the XML to be sure.