alallegro 17.4 导出光绘文件，viewlog提示 WARNING: Null REGULAR-PAD specified for padstack 请问这个是什么问题引起的呢？
WARNING: Null REGULAR-PAD specified for padstack VIA0_5X0_3_MM at
WARNING: Null REGULAR-PAD specified for padstack VIA0_5X0_3_MM at
WARNING: Null REGULAR-PAD specified for padstack VIA0_5X0_3_MM at
WARNING: Null REGULAR-PAD specified for padstack VIA0_5X0_3_MM at