According to another thread about that error, it's possible it happens when you have an ad blocker running.

If turning off ad blockers does not fix it, I recommend using "Report a problem" in the upper right to submit a support request.

~ Janice, KA user

turned my adblocker off, still has the same error.

Since turning off ad blockers does not fix it, did you submit a support request to KA support staff?

I did that first, in fact, before going here.