Is the shape in CAD undefined?
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Why does “Shape not defined” always appear in the command box when opening a CAD drawing? How can we avoid it from happening?
CAD allows for the customization of shapes, just like custom blocks. Some software developed for specific purposes use these customized shapes as templates or symbols, but when providing drawings, the shape files must also be supplied. When opening it, you can choose to cancel the requirement to define shape files; if there are no missing elements in the graphics that you need, you can use the PURGE command or create blocks for only the necessary graphics, so that they will not appear when the graphic is opened.
It’s a font issue; download the font library and place it in the FONTS directory of acad.