Autoweb - failure from system when editing API config

I'm trying to Edit the AP Config of a web service that I've added to Autoweb so that I can hide the sensitive details and then share it. But it comes up with a "failure from system" error when I try to edit the config. If I copy and paste the web service, I get the same error with the pasted web service.

I've not encountered this before.  For all the other APIs in my AutoWeb app, I can Edit configs without issue. I've tried restarting my phone. There's nothing about the error in the AutoWeb log (detailed logs selected). The API actions work fine. Can anyone advise on how to fix?

Using AutoWeb v1.0.beta.2. Android 9

(apologies if this shows up eventually on the Joaoapps forum as well as here; I tried to post there on Saturday but the thread seems to have been lost in the internet black hole).