NUS service don't run correct in MESH

[Giang]

Hi all, I have some question for ask : 

I add NUS service into light switch proxy server example. And I only run nus service part (Don't run Mesh part)

when I use IOS to connect , it disconnect right away and get stuck

when I use Android connect , I can send data , disconnect and reconnect . But when my phone receiver data from Dev Kit , it received its first success, after it get stuck

This image when my kit stuck 

Pls, tell me the reason and how to fix this . Thank very much 

[Giang]

Error at function in mesh_gatt.c : 

        /* TODO: The following events should be handled by an SDK module/the application. */
        case BLE_GATTS_EVT_SYS_ATTR_MISSING:
        {
            uint32_t err_code = sd_ble_gatts_service_changed(p_ble_evt->evt.gatts_evt.conn_handle,
                                                             m_gatt.handles.service,
                                                             m_gatt.handles.service);

            /* Those errors can be expected when sending trying to send Service Changed indication
             * if the CCCD is not set to indicate. Thus set the returning error code to success. */
            NRF_MESH_ASSERT((err_code == NRF_SUCCESS) ||
                            (err_code == BLE_ERROR_INVALID_CONN_HANDLE) ||
                            (err_code == NRF_ERROR_INVALID_STATE) ||
                            (err_code == NRF_ERROR_BUSY));
            NRF_MESH_ERROR_CHECK(sd_ble_gatts_sys_attr_set(p_ble_evt->evt.gatts_evt.conn_handle, NULL, 0, 0));
            break;
        }

error return 6 .