---
sourceDocument: Yokohama IT Operations Management
sourceDocumentLink: https://servicenow-prod.fluidtopics.net/r/yokohama/it-operations-management

 Release :

    - yokohama

ft:locale :

    - en-US

ft:publication_title :

    - Yokohama IT Operations Management

ft:clusterId :

    - itom

bundleId :

    - itom

workflow :

    - Technology


---

# Find the cause of a "No Sensor Defined" error message

# Find the cause of a "No Sensor Defined" error message {#ariaid-title1}

* Release version: Yokohama
* 
* Updated June 5, 2025
* 
* ![](https://www.servicenow.com/docs/portal-asset/ico-clock) 1 minute to read

Every active probe looks for a corresponding sensor to process the data that is collected by the probe. The "No Sensors Defined" message indicates that the corresponding sensor for the probe is missing or inactive.

## Before you begin

Role required: sn_cloud_ops_ws.cloud_ops_admin or admin

## About this task

To find the cause of this error, identify the Short Message field of the error record. This field shows the name of the probe for which the sensor is missing.

## Procedure

1. Depending on the application you're using, do one of the following:
   * To identify the cause of the error using Cloud Discovery Workspace, navigate to Cloud Discovery WorkspaceCloud DiscoveryDiagnosticsDiscovery Log.
   * To identify the cause of the error using Discovery, navigate to AllDiscoveryOutput and ArtifactsDiscovery Log.
   {#t_IdentifyCauseNoSenDefEM__choices_mm2_51k_jsb}
2. Filter the Level column by Error.  
   If you are using Discovery, you can also view the Error Report on the Discovery dashboard.
3. Note the Short Message field of the error record.  
   This field shows the name of the sensor where the error has occurred.
**Related tasks**   

* [Find the cause of a sensor error message](https://servicenow-prod.fluidtopics.net/2nOW~xoGc1LVVX8SeJG81A "Use this procedure to identify a Discovery sensor error.")
* [Fix the cause of a sensor error message](https://servicenow-prod.fluidtopics.net/P0bMu5sNRxNBI83z1m~NQA "To fix a Discovery sensor error message, you must fix the JavaScript file containing the code that generated the error.")
* [Find the cause of a "Probe not found" error](https://servicenow-prod.fluidtopics.net/_iB3679AcTS~ZMLucLmRFg "Verify the correct sys_id of the probe associated with the probe parameter in the payload of the ECC Queue input record.")

*[\>]: and then