Dear Jennifer,

We have never seen that error before, I suspect it may have something to do with your particular computer/network, but can't be sure as I did not get the same error myself.

In fact, I checked how your duplicate checking was going and this triggered the last step in the "get new duplicates" routine (as expected). In the end it delivered the list of duplicate groups without further trouble.
The result is that you should be able to proceed with your work, but also that I will not find out what went wrong and why.

Thanks for letting us know!

Sergio