I had this error in the morning today and ufile stopped responding. I did actions suggested by support email but to no avail. I had to delete the file and with it my days of work 😞
I created a new fie but ufile is still not working. So my original file is gone and I still can't use ufile.
Looking at the other threads, it seems that this is a common problem. Only if I had known, I wouldn't have deleted my original file. 😞