getting excception in notifydatachanged listview adaptor

Quote:

@Override
public void run() {

// TODO Auto-generated method stub
if(ser.FindClients().interact.get(a).drive!=null){

//Log.e("FILEMANAGERACTIVITY", String.valueOf(ser.FindClients().interact.get(a).drive.size()));
fmd = new FileManagerAdaptor(FileManagerActivity.this, R.layout.activity_item_layout, ser.FindClients().interact.get(a).drive);

lst.setAdapter(fmd);
lst.setOnItemClickListener(new OnItemClickListener() {

@Override
public void onItemClick(AdapterView View arg1, int arg2, long arg3) {
// TODO Auto-generated method stub
//Toast.makeText(this, text, duration)
TextView txt = (TextView)arg1.findViewById(R.id.lblName);
Log.e("FILEMANAGERACTIVITY", "Done");
tmp = (String) txt.getText();
itemPosition = arg2;


new Thread(){

@Override
public void run() {
// TODO Auto-generated method stub

ser.FindClients().interact.get(a).ListFiles(tmp, ser.FindClients().interact.get(a).fileType.get(itemPosition));
//while(ser.FindClients().interact.get(a).working!=false);
//fmd = new FileManagerAdaptor(FileManagerActivity.this, R.layout.activity_item_layout, ser.FindClients().interact.get(a).fileNames);
//lst.setAdapter(fmd);
//Log.e("FILEMANAGERACTIVITY", String.valueOf(ser.FindClients().interact.get(a).fileNames.size()));

fmd.Data(ser.FindClients().interact.get(a).fileNames);

fmd.notifyDataSetChanged();

Log.e("FILEMANAGERACTIVITY", "List notified data changed");
//lst.setAdapter(fmd);

}
}.start();


}
});

} else
{
Log.e("FILEMANAGERACTIVITY", "Dives null");
}

Quote:

public List<string> data=null;
private Context con = null;
int layoutId=0;

public FileManagerAdaptor(Context context, int textViewResourceId,List<string> data) {

this.data = data;
this.con = context;
this.layoutId = textViewResourceId;
// TODO Auto-generated constructor stub
}



@Override
public int getCount() {
// TODO Auto-generated method stub

//return super.getCount();
return data.size();

}

@Override
public String getItem(int position) {
// TODO Auto-generated method stub
//return super.getItem(position);
return data.get(position);
}
public void Data(ArrayList<string> data)
{
this.data = data;
//notifyDataSetChanged();
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
View vi = convertView;

LayoutInflater inf =(LayoutInflater) con.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
vi= inf.inflate(layoutId, parent, false);


Log.e("FILEMANAGERADAPTOR", data.get(position));
TextView tx = (TextView) vi.findViewById(R.id.lblName);
tx.setText(data.get(position));
return vi;
}

@Override
public long getItemId(int arg0) {
// TODO Auto-generated method stub
return arg0;
}

}