Try logging into your wiki account, or creating one.
This error will appear:
No active login attempt is in progress for your session.
Creating one will technically work (check Recent changes), but you will get the same error.
We do not know what is happening here, but it is likely an error caused by renaming the database name.
I have also logged this on Phorge: https://issue-tracker.miraheze.org/T13515
