Hello James,
The Error -1712 is not specifically an EndNote error.
The issue is actually caused by an Apple Event Timeout.
Often, such issues can be resolved by simply restarting the computer, if it hasn’t been restarted in a while.
(I know I rarely restart my Macintosh.)
Alternately, if you’re running a substantial number of applications in the background (this includes a Browser window with a a lot of open tabs), or running other programs that take substantial amounts of CPU time, this could also create a scenario where this issue will happen.
If you’re actually using EndNote X6, and getting this message when trying to trigger EndNote to open from Word, the problem is caused by a lack of compatibility with Catalina, which currently requires EndNote X9.3.x.
I do hope this helps!
Thanks,
Steve