Page not found. if i try to open a Post

Hello everyone,

I have a problem with my instance, some posts only display “Page not found.” when they are called up. Can anyone help me why this is happening?

Registration or login works via the Authentic SSO service.

Instance: RollenspielMonster Blog Reader v0.14.0
User page with error:

Open an issue too: "Page not found." if you want to call up individual posts · Issue #844 · writefreely/writefreely · GitHub