Website does not work after logging in

Hello, I am having an issue with my journal page. Everyting was working up until recently. Last action I took was in october (added last journal, retroactively) and at the end of february the site was not working anymore. Version installed was

After that I backed up database and files. I tried to install versions, and the latest one Installation was successful, I get the login screen but every time I log in the site gives me either the blank screen or error 500.

Currently version installed is The problem persists.

This is the log I copied from the point of successful installation to the point where I get the blank screen.

Thanks for any help!