android emulator keeps forceing close in the emulator and no errors shown up

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http://stackoverflow.com – main activitythis code has a log-in screen and data entry screen it was working but wont work now and wont give any errors i fixed this before but can remember package com.Trish.diabetesapp; import android.os.Bundle; import android.app.Activity; import android.content.Intent; import android.view.Menu; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText; import android.widget.Toast; import android.R; public class MainActivity extends Activity { EditText txtUserName; EditText txtPassword; Button btnLogin; Butt (HowTos)