I have had this error for a week and I have Logi Options installed for my MX 3 Mac mouse. Having read a few threads, I have managed to fix using the same process for Logi Options issues in Photoshop. Open Logi Options, navigate to the 'All Applications' tab, from the drop down list do either of these; If Illustrator is missing add it to the list, then open Illustrator, this was my problem and once added its fixed the script issue. If Ilustrator is listed, delete it (first make a note of customisations you have set up, as you will need to put them back afterwards). Open and close Illustrator, go back to Logi Options and add Illustrator back (plus any customs keys), again it should be fixed. There have been many issues with Photoshop for months with Logi Options until somone tried this simple fix, it works for most people with Photshop looks like it could do the same with Illustrator. Logitech cleary have problems when upgrading and linking to Adobe products, this process clears out unwanted Logi Options files and puts new ones back in the right places. Takes 5 mins to give it a go!
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