How To Fix LMON011 - Alert Monitor cannot start: tree variant doesn't include root alert class

SAP Error Message - Details

• Message type: E = Error

• Message class: LMON - Monitor messages

• Message number: 011

• Message text: Alert Monitor cannot start: tree variant doesn't include root alert class

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message LMON011 - Alert Monitor cannot start: tree variant doesn't include root alert class ?

  The SAP error message LMON011 indicates that the Alert Monitor cannot start because the tree variant does not include the root alert class. This typically occurs in the context of SAP's Alert Monitoring functionality, which is part of the Landscape Management Database (LMDB) and is used to monitor system alerts and performance.
  Cause:
  The error is usually caused by one of the following issues:
  
  Missing Root Alert Class: The tree variant that is being used for the Alert Monitor does not include the root alert class, which is necessary for the monitor to function correctly.
  Configuration Issues: There may be a misconfiguration in the alert monitoring settings or the tree variant settings.
  System Updates or Changes: Recent changes or updates to the system may have affected the configuration of the alert classes or the tree variant.
  
  Solution:
  To resolve the LMON011 error, you can follow these steps:
  
  
  Check Tree Variant Configuration:
  
  Go to the transaction code LMON (Alert Monitor).
  Check the configuration of the tree variant being used. Ensure that it includes the root alert class.
  If the root alert class is missing, you will need to modify the tree variant to include it.
  
  
  
  Create or Modify Tree Variant:
  
  If necessary, create a new tree variant or modify an existing one to include the root alert class.
  You can do this by navigating to the relevant configuration area in the SAP GUI where tree variants are defined.
  
  
  
  Review Alert Classes:
  
  Ensure that all necessary alert classes are defined and active in the system.
  You can check the alert classes in the relevant configuration settings.
  
  
  
  Restart the Alert Monitor:
  
  After making the necessary changes, restart the Alert Monitor to see if the issue is resolved.
  
  
  
  Check for System Notes or Patches:
  
  Sometimes, SAP releases notes or patches that address specific issues. Check the SAP Support Portal for any relevant notes related to the Alert Monitor and apply them if necessary.
  
  
  
  Consult SAP Documentation:
  
  Refer to the official SAP documentation for more detailed guidance on configuring the Alert Monitor and tree variants.
  
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as LMON (Alert Monitor) and LMDB (Landscape Management Database).
  SAP Notes: Search for SAP Notes related to LMON011 or Alert Monitor issues in the SAP Support Portal.
  SAP Community: Engage with the SAP Community forums for additional insights and solutions from other users who may have encountered similar issues.
  
  If the problem persists after following these steps, consider reaching out to SAP Support for further assistance.