I'm trying to compile the library  under Delphi XE3


procedure TSingleImage.Assign(Source: TPersistent);
begin
  if Source = nil then
  begin
    Create;
  end
Compiler shows error:
[dcc32 Error] ImagingClasses.pas(583): E2382 Cannot call constructors using instance variables

but builddemos.bat and buildLibrary.bat does their work without any error (

what do I do wrong?