Database may be already in use: null

[CoolMike77]

Hi

I'm using sismics with a H2 database. Since a few days sismics does not start anymore. In the log I found the following message:

Database may be already in use: null

Is there any solution to fix this?

Regards
Michael

[CoolMike77]

I used the repair tool to check the H2 database. I did not get an error and I have now a .sql file.

The H2 database I can not open in DBeaver.

It looks like I should switch to Postgres, but how it this now possible?

I have a daily backup of the server for 7 days, but unfortunately the problem exists also in the oldest backup.

Is there any solution to export the files, so I could start again?