Out of the 4 units I recently purchased one of them kept doing this to me. The only way I could get it working was to reset to factory default. I kept getting this error when I tried updating to the latest version groov. I am currently running the version it resets to without issues.
I used up a whole day with this problem and recall posting a thread about it…
here is my thread: https://forums.opto22.com/t/strange-ar1-problems-with-node-red-out-the-box/1930