My b2evolution Version: Not Entered

Just overnight without doing anything I got below messages and nothing shown .. I have used the installed version several months without any problems.

What can be the issue and how to solve?

Thanks Hans

This is b2evolution version 3.2.0-beta.

You cannot use the application before you finish configuration and installation.

Database schema is not up to date!

You have schema version «9960», but we would need «9940».

Please use the installer to finish your configuration/installation now.

On most installations, the installer will probably be either here or here... (but I can't be sure since I have no config info available! :P)