I started Joplin and got the following fatal error. I have already upgraded to the latest version.
I get the same error whey I try to restart in safe mode.
Have you recently installed and then uninstalled one of the pre-release versions? I believe that the 2.14.x series uses profile version 45 and so installing it would have updated your local profile / database.
Pre-releases are available here. Using a 2.14.x version should get you back up and running.