Hello,
This message is usually connected to a Google server or internet connection that was temporarily unavailable.
Most of the time this issue should resolve itself within a few minutes.
It is curious that you are only seeing this message on one particular sheet and not on others that also have Autocrat jobs (I'm guessing you have checked within the same timeframe)
I would also double-check that you are only logged into one Google account (multiple accounts open can cause permission issues) and all files connected to this job are on your drive (not a team or shared drive). You can also try an incognito window to rule out another add-on or extension interfering with Autocrat from running.
Thanks!