progress dialog causes app to stop

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dialog

Android4x

On button click I want to show a progress dialog & load data to parse server, for this, I created a progress dialog and within run() I created a loaddata() which will load data to server & then dismiss the progress dialog.
when I click the button, Progress dialog should be visible but app got stopped instead..why?
My code -

final ProgressDialog p = ProgressDialog.show(getApplicationContext(), "Registration",
"You are being registered", true, false);
new Thread(new Runnable() {
public void run() {
loaddata();
p.cancel();
}
}).start();
private int issuccessful(ParseObject testObject) {
				// TODO Auto-generated method stub
				try {
					testObject.save();
					return 1;
				} catch (ParseException e) {
					// TODO Auto-generated catch block
					return 2;
				}
			}

private void loaddata() {
			ParseObject testObject = new ParseObject("Register");
				testObject.put("u_id", "v0001");
				testObject.put("f_name", a);
				testObject.put("m_name", x);
				testObject.put("l_name", c);
				testObject.put("contact", d);
				int y = issuccessful(testObject);
				if (y == 1) {
Toast.makeText(getApplicationContext(),"Successfully Registered!!",
Toast.LENGTH_LONG).show();
				} else {
					Toast.makeText(getApplicationContext(),
							"Sorry for inconvenience please try again",
							Toast.LENGTH_SHORT).show();
				}
			}