 file...possibly a file is not being modified by this writer...");    SET_FUNCTION_RETURN_VALUE(UNDEFINED)      }        Local<Value> newInstance = pdfWriter->holder->GetNewDocumentCopyingContext(args);      ObjectWrap::Unwrap<DocumentCopyingContextDriver>(newInstance->TO_OBJECT())->CopyingContext = copyingContext;      SET_FUNCTION_RETURN_VALUE(newInstance)  }    METHOD_RETURN_TYPE PDFWriterDriver::CreatePDF