Seem to be getting this a lot when adding Sonos alerts , does seem to be doing what it is supposed to do but this invalid time element even though these events are not time based or have any time elements set to it.
Having the same problem. Talk to tech-support. They’re working on it
Should be fixed now, I had the same issue and they responded back to me this afternoon that it was fixed - worked like a charm when I tried again.
I am back on track also