VSCODE报错File project_description.json cannot be found.的原因？

测试工程：使用官方例程 ble_ibeacon。
编译环境：VSCODE 1.5.6
    case ESP_GAP_BLE_SCAN_RESULT_EVT: {
        esp_ble_gap_cb_param_t *scan_result = (esp_ble_gap_cb_param_t *)param;
        switch (scan_result->scan_rst.search_evt) {
        case ESP_GAP_SEARCH_INQ_RES_EVT:
            /* Search for BLE iBeacon Packet */
            if (esp_ble_is_ibeacon_packet(scan_result->scan_rst.ble_adv, scan_result->scan_rst.adv_data_len)){
                esp_ble_ibeacon_t *ibeacon_data = (esp_ble_ibeacon_t*)(scan_result->scan_rst.ble_adv);
                ESP_LOGI(DEMO_TAG, "----------iBeacon Found----------");
                esp_log_buffer_hex("IBEACON_DEMO: Device address:", scan_result->scan_rst.bda, ESP_BD_ADDR_LEN );
                esp_log_buffer_hex("IBEACON_DEMO: Proximity UUID:", ibeacon_data->ibeacon_vendor.proximity_uuid, ESP_UUID_LEN_128);

                uint16_t major = ENDIAN_CHANGE_U16(ibeacon_data->ibeacon_vendor.major);
                uint16_t minor = ENDIAN_CHANGE_U16(ibeacon_data->ibeacon_vendor.minor);
                ESP_LOGI(DEMO_TAG, "Major: 0x%04x (%d)", major, major);
                ESP_LOGI(DEMO_TAG, "Minor: 0x%04x (%d)", minor, minor);
                ESP_LOGI(DEMO_TAG, "Measured power (RSSI at a 1m distance):%d dbm", ibeacon_data->ibeacon_vendor.measured_power);
                ESP_LOGI(DEMO_TAG, "RSSI of packet:%d dbm", scan_result->scan_rst.rssi);

                if ((10167 == major ) && (61958 == minor) )
                {
                    // esp_ble_gap_stop_scanning();
/********************************************************************************************************************

如果注释掉下面的函数，编译是正常的；但是如果保留下面函数语句，build 过程中会提示File project_description.json cannot be found.

**********************************************************************************************************************/
                     ESP_LOGI(DEMO_TAG, "SCAN STOP");
                }
            }
            break;
        default:
            break;
        }