Thanks! Did you use it before? Like a month ago or two? Migrated from one database to another, then some users got this first time coming back.
It happens sometimes that the browser locks the database, for normal use this shouldn't happen, but when I'm developing, I often end up with at least 10 tabs with the app and reloading constantly.
What browser are you using?
This should rarely happen, so would be interested to know a bit more how you got to this point, maybe I can add some improvements. If database is completely locked, it might need a process kill of the browser (or restart).