Error starting InterpretBank with synchronized database
this means that the database - that has been moved into a Cloud Service like DropBox or OneDrive - is not more accessible in that directory. You can see the directory in the error message.
This error has nothing to do with InterpretBank, but solely with the cloud service. Reasons may be that a) the database has been moved b) that it is temporarily blocked by the cloud service (for whatever reason).
You may try to a) check the directory to see if the database is there (if not move it there) or b) temporarily stop the cloud service so that it releases the database (if there).