org.json.simple.JSONObject cannot be cast to java.util.List

try {
                JSONObject output = serviceContext.executeService(GET_UNREGISTER_RESELLER_DETAIL_LIST, jsonInput);
                JSONObject result = JSONObjectUtil.getResult(output);
                log.info("RESULT == " + result);
                if (ServiceResult.isOk(output)) {
                    log.info("output_OK:");
                    gridList= (List<JSONObject>) result.get("unregisterResellerDetailList");
                } else if (ServiceResult.isFail(output)) {
                    MessageHelper.displayError(result);
                }
            } catch (Exception ex) {
                log.info(ex.getMessage(), ex);
                MessageHelper.displayError(ex.getMessage());
            }


================================================================
//error nya
java.lang.ClassCastException: org.json.simple.JSONObject cannot be cast to java.util.List
    at org.jleaf.erp.mlm.web.controller.unregisterreseller.InputUnregisterResellerController.loadUnregisterResellerDetail(InputUnregisterResellerController.java:211)
    at org.jleaf.erp.mlm.web.controller.unregisterreseller.InputUnregisterResellerController.prepareEdit(InputUnregisterResellerController.java:144)