Android - เปิดหน้า Activity ไม่ได้ค่ะ ขึ้น Unable to start activity ComponentInfo

public class SignUp_guest extends Activity {	
	 EditText txtUsername;
    EditText txtPassword;
     EditText txtConPassword;
    
    
   @SuppressLint("NewApi")
	@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.guest_signup);

        // Permission StrictMode
        if (android.os.Build.VERSION.SDK_INT > 9) {
            StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
            StrictMode.setThreadPolicy(policy);
        }
        
         txtUsername = (EditText)findViewById(R.id.txtUserName); 
         txtPassword = (EditText)findViewById(R.id.txtPassword); 
         txtConPassword = (EditText)findViewById(R.id.txtCon); 
        
        // btnSave
        final Button btnSave = (Button) findViewById(R.id.btnsms);
        // Perform action on click
        btnSave.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
            	if(SaveData())
            	{
            		 Intent i = new Intent(getApplicationContext(), SignUp_guest.class);
                     startActivity(i);
            		
            	}
            }	
        });
        
    }