The macro in question is ops4j-page-style. A search reveals that there are 47 pages affected by this, all of them showing an error. Did this macro exist once and should be recreated, or was it removed, and all references to it should be cleaned up?
Those macros existed in our old, self hosted confluence instance back in 2010.
When moving to Atlassian Studio (hosted) we lost many of the old macros - though new confluence versions also got new capabilities.
Now, having said that: yes those pages are awaiting cleanup. Most simply by removing the macro tags and getting the layout pretty.
This is a matter of volunteering and project docs that have been requested/touched a log recently.
Thanks for opening the ticket. Would be cool if you can help out if interested!
I have started removing these macros.
I have removed the broken macro from all pages that I could edit (there were some I could not edit, though I don't know why, maybe they are archived?).