Studio 16 doesn't start --> Failed to write to database fold

Dear,

I purchased the Resolve 16 true the AppStore and went just really smooth untill 1 hour or so.

While exporting my clip the system suddenly did shut down and now I am not able to open Davinci Resolve Studio 16 anymore.

I get the message "Failed to write to database folder" and after clicking on the "OK" button it closes the app.

Already tried to reinstall the app but problem remains the same.

how can this be solved easily ?

MacPro user with Catalina, data stored on a QNAP

thanks in advance how to solve this issue,
Gabriël