android - ListView crashing the my application why? -

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my app crashed when try scroll down in listview i've tried trace error couldn't find , activity works fine when try scroll down app getting crashed , please guys tell me error or mess in code ?

i had removed scroll down effect , removed 

lv.setonscrolllistener(new onscrolllistener()

but still same problem

listview xml 

<?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools"     android:orientation="vertical"      android:layout_width="fill_parent"     android:layout_height="fill_parent"     android:background="@drawable/background_scroller"     >      <listview         android:id="@+id/ringtonelistview"         android:layout_width="fill_parent"         android:layout_height="fill_parent"          android:background="@drawable/scrollback"         android:divider="#93c7e8"         android:dividerheight="1dp" />  </linearlayout>

here set object long 

convertview.settag(r.getlong("toneid"))

and want same object view. viewholder (type view)

holder = (viewholder) convertview.gettag();

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