Todo funciona, excepto cuando llega hasta la última parte del código con "¡Registrado correctamente!" entonces el error como se menciona en el título aparece dentro de la parte del mensaje registerDialog.

¿Algo estoy haciendo mal? ¿Puede alguien ayudarme a revisar mi código?

Muchas gracias.

La aplicación no se bloqueó, aunque simplemente volvió a la página principal de la aplicación. y si vuelvo a presionar el botón de registro, volverá con el mismo error.

privado void setRegister (Button b) {b.setOnClickListener (new View.OnClickListener () {

        private AsyncTask<String, Void, String> task2;

        public void onClick(View v) {
            // TODO Auto-generated method stub
            registerDialog = new AlertDialog.Builder(Login.this).create();
            registerDialog.setTitle("Register Alert!");
            registerDialog.setButton(DialogInterface.BUTTON_NEGATIVE, "Back", new DialogInterface.OnClickListener() {

                        public void onClick(DialogInterface dialog, int which) {
                            // TODO Auto-generated method stub
                            registerDialog.dismiss();
                        }
                    });

            task2 = new AsyncTask<String, Void, String>() {

                ProgressDialog dialog2;
                ArrayList<NameValuePair> postParameters2;
                String response2 = null;

                    @Override
                    protected void onPreExecute() {
                        postParameters2 = new ArrayList<NameValuePair>();
                        postParameters2.add(new BasicNameValuePair("usernamelog", rUsername.getText().toString()));
                        postParameters2.add(new BasicNameValuePair("passwordlog", rPassword.getText().toString()));
                        postParameters2.add(new BasicNameValuePair("rpasswordlog", rRpassword.getText().toString()));
                        postParameters2.add(new BasicNameValuePair("emaillog", rEmail.getText().toString()));
                        postParameters2.add(new BasicNameValuePair("phonenumlog", rPhoneNum.getText().toString()));
                        postParameters2.add(new BasicNameValuePair("doblog", rBirthday.getText().toString()));
                        postParameters2.add(new BasicNameValuePair("genderlog", rGender.getText().toString().toUpperCase(Locale.ENGLISH)));                 

                        dialog2 = new ProgressDialog(Login.this, ProgressDialog.STYLE_SPINNER);
                        dialog2.setMessage("Registering...");       

                        dialog2.show();
                    }

                    @Override
                    protected String doInBackground(String... params) {
                        try {
                            response2 = CustomHttpClient.executeHttpPost("http://whatstherex.info/checkR.php", postParameters2);

                            String res2 = response2.toString();

                            res2 = res2.replaceAll("null", "");

                            if (res2.equals("1")) {
                                res2 = "Successfully Registered!";
                                rAuth.setTextColor(Color.GREEN);
                                return res2;
                            } else {
                                res2 = res2.toString();
                                rAuth.setTextColor(Color.RED);
                                return res2;
                            }
                        } catch (Exception e) {
                            res2 = e.toString();
                            rAuth.setTextColor(Color.BLACK);
                            return res2;
                        }
                    }

                    @Override
                    protected void onPostExecute(String result2) {
                        if(!result2.equals("Successfully Registered!") && !result2.equals("Username have to be at least 5 characters") && !result2.equals("Password have to be at least 8 characters") && !result2.equals("Passwords does not match") && !result2.equals("Email field is empty") && !result2.equals("Email field is not valid") && !result2.equals("Phone number Field is empty") && !result2.equals("Phone number is not numeric") && !result2.equals("Phone number is not 8 digit") && !result2.equals("Birthday Field is empty") && !result2.equals("Birthday is not numeric") && !result2.equals("Birthday is not in DDMMYYYY format") && !result2.equals("Gender Field is empty") && !result2.equals("Gender Field is invalid") && !result2.equals("Gender not in the format M or F") && !result2.equals("Duplicate entry '"+rUsername.getText().toString()+"' for key 'username'") && !result2.equals("Duplicate entry '"+rEmail.getText().toString()+"' for key 'email'") && !result2.equals("Duplicate entry '"+rPhoneNum.getText().toString()+"' for key 'phoneNum'")){
                        rAuth.setText("Unknown Error!!!");
                        rAuth.setTextColor(Color.BLUE);
                        registerDialog.setMessage(result2);
                        registerDialog.show();
                        dialog2.dismiss();
                        }else if (result2.equals("Duplicate entry '"+rUsername.getText().toString()+"' for key 'username'")) {
                            rAuth.setText("Username already in used");
                            rAuth.setTextColor(Color.RED);
                            registerDialog.setMessage("Username already in used");
                            registerDialog.show();
                            dialog2.dismiss();
                        }else if (result2.equals("Duplicate entry '"+rEmail.getText().toString()+"' for key 'email'")) {
                            rAuth.setText("Email already in used");
                            rAuth.setTextColor(Color.RED);
                            registerDialog.setMessage("Email already in used");
                            registerDialog.show();
                            dialog2.dismiss();
                        }else if (result2.equals("Duplicate entry '"+rPhoneNum.getText().toString()+"' for key 'phoneNum'")){
                            rAuth.setText("Phone number already in used");
                            rAuth.setTextColor(Color.RED);
                            registerDialog.setMessage("Phone number already in used");
                            registerDialog.show();
                            dialog2.dismiss();
                        }else {
                            rAuth.setText("Successfully Registered!");
                            rAuth.setTextColor(Color.GREEN);
                            registerDialog.setMessage("Successfully Registered!");
                            registerDialog.show();
                            dialog2.dismiss();
                        }
                    }

            };
            task2.execute();                                    
        }
    });         
}