Re: Export error?
I would amplify what Mike stated keep your drawing/layout simple. Don't have complex gradients of colour, little or no transparency, don't have dropped shadows use blends, little or no bevels use contours instead. All of these things and a few bit more are rendered as a bitmap on export as .ai/PDF and if you are using a scale they will be reduced from 300 dpi down to 150. Although in itself is fine but detail will be reduced, you can go down to as low as 120 dpi before things look a bit iffy. If you have a few bitmaps in your layout be patient when saving and before that close all programmes down, try to free up as much memory as you can, by stopping background programmes through either a optimizer or the task manager to give your computer the best chance of saving the PDF file.
Design is thinking made visual.
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