I solved the problem. I installed one of the old backups and the problem is solved

Could it be that it doesn't show up due to the theme?

I say the same thing every time. i don't use the cache plugin and it gives the same error even though i remove the cache. I don't know what they are. ...

I discovered that. when i get to the forum/ page nothing appears. Other than that, all the pages are visible.

I turned off caching in Settings. I don't know how else it's cached I'm making a mistake somewhere. But I can't find where I did it

@dimalifragis yes, I've tried to remove it before, but I couldn't. I don't know what it's about. I don't use any other plugins other than WpForo and a...

I did not use any caching plugin. I canceled the cache from wpforo too

I don't know how to remove it. Can you explain it in detail?