I am having this error on v0.9.1. MacOS 11.4 Mac mini (M1, 2020).
I have 3 external drives connected however I know they’re spinning as I have just opened the drives in finder. Interestingly this bug occurred immediately after the welcome/setup dialog. It then prevents the app from starting correctly after that. Even clicking “preferences” seems to cause a crash or close of the app.
EDIT: One of these drives is used for Time Machine. I assume it might be this bug: Apple silicon support - #4 by mrm