How To Fix IST_TC018 - CL_IST_TC_MEMORY class has not been instantiated

SAP Error Message - Details

• Message type: E = Error

• Message class: IST_TC - Telecom Classes

• Message number: 018

• Message text: CL_IST_TC_MEMORY class has not been instantiated

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 IST_TC018 - CL_IST_TC_MEMORY class has not been instantiated ?

  The SAP error message "IST_TC018 CL_IST_TC_MEMORY class has not been instantiated" typically indicates that there is an issue with the instantiation of a class in the SAP system, specifically the CL_IST_TC_MEMORY class. This error can occur in various scenarios, often related to custom developments or specific transactions that rely on this class.
  Cause:
  
  Class Not Instantiated: The error suggests that the class CL_IST_TC_MEMORY has not been instantiated properly before it is being used. This could be due to a missing or incorrect instantiation code in the ABAP program.
  Missing Implementation: The class might not be implemented in the system, or there could be a version mismatch if the class is part of a custom development or an add-on.
  Authorization Issues: Sometimes, the user might not have the necessary authorizations to access or instantiate the class.
  Configuration Issues: There may be configuration settings that are not correctly set up, leading to the class not being available when needed.
  
  Solution:
  
  Check Class Implementation: Verify that the class CL_IST_TC_MEMORY is implemented in the system. You can do this by navigating to the ABAP Workbench (SE80) and checking if the class exists.
  Instantiate the Class: Ensure that the class is instantiated correctly in the ABAP code. For example:
  DATA(lo_memory) = NEW cl_ist_tc_memory( ).
  Make sure this line is executed before any methods of the class are called.
  
  Review Custom Code: If this error arises from custom code, review the relevant ABAP code to ensure that the class is being instantiated properly and that there are no logical errors.
  Check Authorizations: Ensure that the user has the necessary authorizations to access the class and its methods.
  Consult Documentation: If the class is part of a third-party add-on or SAP component, consult the relevant documentation or support resources for any specific requirements or known issues.
  Debugging: If the issue persists, consider debugging the program to trace where the instantiation is failing and gather more context about the error.
  
  Related Information:
  
  SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that might address this specific error or provide patches or updates.
  Community Forums: Look for discussions in SAP Community forums or other developer forums where similar issues may have been discussed.
  Version Compatibility: Ensure that your SAP system is up to date and that all components are compatible with each other, especially if this error started occurring after a system upgrade or patch.
  
  If the problem continues after trying the above solutions, it may be beneficial to reach out to SAP support for further assistance.