When you run into issues with FreeDATA, please follow these steps prior to claiming a bug.
Run git pull to make sure you are running latest FreeDATA code. Even if you think you just updated a couple of hours ago, pull. Development is quite dynamic!
Make sure that all necessary requirements are met by running pip3 install -r requirements.txt (in folder /FreeDATA).
Update all GUI/Java related packages by running npm i in /FreeDATA/gui.
If steps above are not working, delete the config file, stored in your operating systems app directoy ( example Ubuntu: home/