Hi, all! I've just come across this error, too, but in Designer. These were my first attempts ever to import a Photoshop file to Designer. I'm attaching the file and a screenshot of the message (+ more info below):
carousel test.psd
Now, this didn't really cause any issues for me. Since it has to do with vectors, I guess that the shape layers in PS carry two properties which don't have analogs set up in AD. I did a little troubleshooting and my removed shape layers one by one, I saved and imported again. The list of unknown properties got shorter when I deleted a subtracted shape, as well as also two rectangles which somehow were different than the rest of my rectangles (because the latter didn't seem to change the contents of the list). Hope this helps!