Error when publishing changes

Using Concrete / Help
1

Core Version - 8.5.9
Version Installed - 8.5.9

I am trying to change the font size and alignment but get this error when I try and publish changes:

{“time”:“2024-02-13 21:44:29”,“message”:null,“title”:null,“redirectURL” with our website listed after.

2

Can you paste the environment information here? At first glance, it’s not ringing any bells. Also I would advise upgrading to the latest version of v8, or v9 if possible.