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Why is this an issue?

  An empty interface declaration is superfluous as it defines no methods to implement.

How to fix it
Remove or populate the interface declaration.

  If desired, it can be replaced with IInterface for the same effect:

type
  IRefCounted = interface
  end;

  TMyClass = class(TObject, IRefCounted)
    // ...
  end;

type
  TMyClass = class(TObject, IInterface)
    // ...
  end;


  Note that this is not a recommended approach, as nothing on the object will be accessible through
  the interface.

Resources

  
    
      RAD Studio documentation: Object Interfaces (Delphi)