Using Mac (Mojave).
Current workaround for Google Scholar appears to be:
When you get the error, click on “ok”
From EndNote, select File > import
Click on “options” bottom left and make sure that the “import options” is EndNote (mine was PDF)
Navigate to your downloads folder and select tha latest file.
Kopernio doesn’t appear to have the bug.
(Sorry, just noticed the same answer was posted in the “how to” section.)