The application has stopped unexpectedly

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Android

Hi I'm trying to display farsi textview in my application,but it has error to close the application.
This is my code of Main.java:

public class MainActivity extends Activity {

TextView txt;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
		
txt = (TextView) findViewById(R.id.textview1);
		
Typeface face = Farsi.GetFarsiFont(this);
txt.setTypeface(face);
txt.setText(Farsi.Convert("سلام"));
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}

and this is my xml code :

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<TextView
android:id="@+id/textview1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="right"
android:text="@string/hello_world" />

</LinearLayout>

when I comment

Typeface face = Farsi.GetFarsiFont(this);
txt.setTypeface(face);
txt.setText(Farsi.Convert("سلام"));

it work properly.
Please help me what i should do.