How To Fix DMCLG178 - Class name &1 is not known in class builder

DMCLG178 - Overview

• Message type: E = Error

• Message class: DMCLG - DMC Tool Development

• Message number: 178

• Message text: Class name &1 is not known in class builder

What causes this issue?

Classes must actively exist in the ABAP Workbench Class Builder before
registering in the interface register

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

DMCLG178 - Details

• The SAP error message DMCLG178, which states "Class name &1 is not known in class builder," typically occurs when you are trying to access or reference a class in the ABAP Class Builder that does not exist or is not recognized by the system. Here’s a breakdown of the cause, potential solutions, and related information:
  
  Cause:
  
  Non-Existent Class: The class you are trying to use has not been created or does not exist in the system.
  Typographical Error: There may be a typo in the class name you are trying to reference.
  Authorization Issues: You may not have the necessary authorizations to view or access the class.
  Transport Issues: If the class was recently transported from another system, it may not have been imported correctly.
  Namespace Issues: The class might be in a different namespace that is not accessible in your current context.
  
  Solutions:
  
  
  Check Class Existence:
  
  Go to the Class Builder (Transaction SE24) and check if the class