Android :: Navigation From One Screen To Another Screen Not Working

public class check extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);}

void myonclick(View view)
{
Intent mIntent = new Intent(this,check2.class);
startActivity(mIntent);...............

when i click a button it will show error in emulator has (The Application Check has stopped unexpectedly).