WordPress permission errors since update

My site at https://dj.terrum.co.uk has permission errors and I can’t access wp-admin either. I can’t seem to find any fix for this. I tried replacing all core files too.

EDIT: Seems to be an issue with the theme. Whilst I understand the the_world_is_listening_ote049 theme is incredibly outdated. The errors don’t look too serious to be able to fix easily. Any help with this?