I have just encountered the same problem. I am unable to open a client I had just made changes to prior to submitting it for electronic filing but get the same message "unable to read data, restart the program" or words to that effect. My file is probably corrupt as my keyboard froze and I turned the machine off. I do not have a backup of the current year file. I suppose I might have to delete the file for 2019, go back to the 2018 file and transfer it to 2019 again and start over? Any help?