How To Fix WWP1002 - Error occurred when calling the constructor for class CL_GUI_LIST_TREE

SAP Error Message - Details

• Message type: E = Error

• Message class: WWP1 - Planning Workbench

• Message number: 002

• Message text: Error occurred when calling the constructor for class CL_GUI_LIST_TREE

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 WWP1002 - Error occurred when calling the constructor for class CL_GUI_LIST_TREE ?

  The SAP error message WWP1002 indicates that there was an issue when trying to instantiate the class CL_GUI_LIST_TREE. This class is typically used for creating tree structures in SAP GUI applications. The error can arise due to various reasons, and here are some common causes, potential solutions, and related information:
  Causes:
  
  Missing or Incomplete Configuration: The GUI components may not be properly configured in the SAP system.
  Memory Issues: Insufficient memory or resources available on the application server or client machine.
  Incorrect Parameters: The parameters passed to the constructor may be incorrect or not in the expected format.
  Authorization Issues: The user may not have the necessary authorizations to access the GUI components.
  SAP GUI Version: The version of SAP GUI being used may not be compatible with the version of the SAP system.
  
  Solutions:
  
  Check Configuration: Ensure that the GUI components are correctly configured in the SAP system. This may involve checking the settings in transaction codes like SE80 or SE41.
  Memory Management: Monitor the memory usage on the application server and client. If necessary, increase the memory allocation or close other applications to free up resources.
  Review Parameters: Double-check the parameters being passed to the constructor of CL_GUI_LIST_TREE. Ensure they are valid and correctly formatted.
  Authorization Check: Verify that the user has the necessary authorizations to access the GUI components. This can be done by checking the user roles and authorizations in transaction SU53 or SU01.
  Update SAP GUI: Ensure that you are using a compatible version of SAP GUI. If necessary, update to the latest version that is compatible with your SAP system.
  Debugging: If you have access to the ABAP code, you can debug the program to identify the exact point of failure and gather more information about the error.
  
  Related Information:
  
  SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that may address this specific error. You can search for the error message or the class name.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they found.
  Documentation: Review the official SAP documentation for CL_GUI_LIST_TREE to understand its usage and requirements better.
  
  If the issue persists after trying the above solutions, it may be beneficial to contact SAP support for further assistance.