"An unknown imaging construct was encountered"

Question

I have exported a vector PDF from OpenStreetMap. If I open the PDF in Reader everything looks good. When I import into Illustrator, I get the following error: “An unknown imaging construct was encountered.” I click “Ok” and I can see that the water and coastline is missing. Is there a way to prevent this? Thanks.

Monika Gause · Answer

You can create a new Illustrator file and then place the PDF, linked, not embedded. Then select it and Object > Flatten transparency

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