android ไม่สามารถแปลง json object มาเก็บไว้ใน JSONArray และ logcat แจ้งข้อความ org.json.JSONException: No value for report_data

protected String doInBackground(String... args) {
		// TODO Auto-generated method stub
					runOnUiThread(new Runnable() {
						public void run() {
							email = inputEmail.getText().toString();
							List<NameValuePair> params = new ArrayList<NameValuePair>();
							params.add(new BasicNameValuePair(TAG_EMAIL, email));
							JSONObject json = jsonParser.makeHttpRequest(user_detail, "GET", params);
							Log.d("get all permission", json.toString());
							
							try {
								int success = json.getInt(TAG_SUCCESS);
								if(success == 1){
									userObj = json.getJSONArray("report_data"); <---------เออเรอร์ตรงนี้ครับ
									JSONObject c = userObj.getJSONObject(0);
										
									String uid = c.getString(TAG_UID);
									//String name = c.getString(TAG_NAME);
									
									// Launch Dashboard Screen
									Intent main = new Intent(getApplicationContext(), MainReport.class);
									main.putExtra(TAG_UID, uid);
									
									startActivity(main);
									
						 			// Close Login Screen
									finish();
									
								}
								
							} catch (JSONException e) {
								// TODO: handle exception
								e.printStackTrace();
							}
						}
					});
					return null;
	}