Delphi Error – E2561 Specified options for $EXTERNALSYM and $NODEFINE are not allowed for ‘%s’; only global and non-alias type symbol

Delphi Compiler Error

E2561 Specified options for $EXTERNALSYM and $NODEFINE are not allowed for ‘%s’; only global and non-alias type symbol

Reason for the Error & Solution

This occurs when declaring a local alias as either $EXTERNALSYM or $NODEFINE.

program E2561;

{$APPTYPE CONSOLE}

uses
  SysUtils;

type
  TAlias1 = TObject;
  {$NODEFINE TAlias1 'sss'} //E2561

  TAlias2 = TObject;
  {$EXTERNALSYM TAlias2 'sss'} //E2561

begin

end.