---
title: "Troubleshooting NavVis VLX warnings and errors"
slug: "troubleshooting-navvis-vlx-warnings-and-errors"
description: "NavVis VLX scanning warnings WARN_LASER_HORIZ_INVALID_MEAS, WARN_SYSTEM_LOAD_HIGH and errors ERR_IMU_RATE_LOW, ERR_NODE_NOT_RUNNING, ERR_IMU_VALUES_NAN. Click Save dataset on the Unexpected error screen; it autosaves after 20 seconds."
tags: ["Troubleshooting", "G11", "G10", "G9"]
updated: 2025-09-23T12:40:24Z
published: 2025-09-23T12:40:24Z
canonical: "knowledge.navvis.com/troubleshooting-navvis-vlx-warnings-and-errors"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://knowledge.navvis.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Troubleshooting NavVis VLX warnings and errors

## Introduction

### Problem description

If the mobile scanning system detects a problem, it displays a notification, warning, or error. Warnings can be resolved by the operator without stopping the mapping session, while errors cannot be resolved without restarting the mapping session.

### Types of warnings

The following shows a list of warning messages displayed during scanning:

| **Code** | **Description** |
| --- | --- |
| WARN_LASER_HORIZ_INVALID_MEAS | **Message:** Please move the front of the device towards the closest (< 30m) wall. |
| **Cause:** The horizontal laser is not acquiring enough close points for a stable and consistent localization of the device. |
| WARN_SYSTEM_LOAD_HIGH | **Message:** Please slow down or pause the mapping for a while. |
| **Cause:** The system has a high computation usage. This can be due to a long mapping time. To achieve best results, the system should not work at full capacity. |
| WARN_NODE_LOAD_HIGH | **Message:** Please slow down or pause the mapping for a while. |
| **Cause:** A software component has a high computation usage. This can be due to a long mapping time. In order to achieve best results, a software component should not work at full capacity. |

### Types of errors

The following shows a list of error messages displayed during scanning:

| **Code** | **Description** |
| --- | --- |
| ERR_IMU_RATE_LOW ERR_LASER_HORIZ_RATE_LOW | **Message:** Something went wrong! The current dataset will be stopped and saved |
| **Cause:** The sensor is not running with the expected rate. A long mapping time might be the cause for this behavior. |
| ERR_IMU_NO_MSGS_YET ERR_LASER_HORIZ_NO_MSGS_YET | **Message:** Something went wrong! The current dataset will be stopped and saved |
| **Cause:** The sensor has not sent any data yet. This is most likely a hardware problem. |
| ERR_IMU_MSG_TOO_OLD ERR_LASER_HORIZ_MSG_TOO_OLD | **Message:** Something went wrong. The current dataset will be stopped and saved. |
| **Cause:** The sensor stopped sending data. This is most likely a hardware problem, but a long mapping time might be the cause for this behavior. |
| ERR_NODE_NOT_RUNNING | **Message:** Something went wrong! The current dataset will be stopped and saved. |
| **Cause:** A critical software component is not running. |
| ERR_IMU_VALUES_NAN | **Message:** Something went wrong! The current dataset will be stopped and saved. |
| **Cause:** The IMU is sending invalid data. This is most likely a hardware problem |

## Troubleshooting procedure

1. From the **Unexpected error** screen, click **Save dataset** to manually stop and save the current dataset. The NavVis VLX automatically saves the dataset after 20 seconds.

![](https://cdn.document360.io/bf174766-fa1a-4fe1-a4d7-b1db1e7cb996/Images/Documentation/troubleshooting-navvis-vlx-warnings-and-errors-image-iowudp0h.png)
2. Once the dataset is saved, restart the device by pressing the power button.
3. Start a new dataset.

---

### FAQ

#### What happens if the mobile scanning system detects a problem?

If a problem is detected, the system displays a notification, warning, or error.

#### Can warnings be resolved without stopping the mapping session?

Yes, warnings can be resolved by the operator without stopping the mapping session.

#### What should I do if I see the warning 'WARN_LASER_HORIZ_INVALID_MEAS'?

You should move the front of the device towards the closest wall that is less than 30 meters away.

#### What does the error 'ERR_IMU_RATE_LOW' indicate?

This error indicates that something went wrong, and the current dataset will be stopped and saved due to the sensor not running at the expected rate.

#### Is it necessary to restart the mapping session after an error occurs?

Yes, errors cannot be resolved without restarting the mapping session.

#### What should I do if I encounter a high system load warning?

You should slow down or pause the mapping for a while to achieve better results.

#### How can I manually stop and save the current dataset during an unexpected error?

From the Unexpected error screen, click 'Save dataset' to manually stop and save the current dataset.

#### What is the first step in the troubleshooting procedure after an error?

The first step is to click 'Save dataset' to manually stop and save the current dataset.

#### What causes the warning 'WARN_NODE_LOAD_HIGH'?

This warning is caused by a software component having high computation usage, often due to a long mapping time.