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fail to save

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当我保存时,报错如下:

14:25:00 Traceback (most recent call last):

14:25:00 File "<frozen ..src.GUI.toolbar.toolbox>", line 349, in on_save_menu

14:25:00 File "<frozen ..src.GUI.toolbar.toolbox>", line 244, in on_save_case

14:25:00 AttributeError: 'NoneType' object has no attribute 'Placement'

应该怎么解决呢?