See if anything in this post will help. Mojave or Catalina: how to get the BeatBuddy Manager (BBM) installed and working
The BeatBuddy Manager (BBM) works well for me in Mojave and Catalina (when I’m working in Catalina).
Your problem is all the more troubling since you’re also reporting that you are unable to access or edit any files on the BeatBuddy (BB) pedal. Usually these symptoms could be caused by using a special character such as a period (.) or other special character to name beats, songs or folders in your BBM project. If song names or folders have been misnamed, it corrupts users’ projects.
Hopefully you have a backup SD card with a good project still on it. If not, a backup SD card is cheap insurance for performing musicians.
The only thing I would suggest is that you delete the BBM software as well as your bbworkspace folder and to reinstall with a freshly downloaded copy of the BBM and follow the instructions in the link I provided above.
If you’d like, I’ll be more than happy to try and determine if your project can be restored. You may contact me via private message (PM). No guarantees, though.
I moved your post to a new thread.