Forum has disappeared.....
I have no idea, what happend. I have not installed anything new in the last month. Today I noticed, that the forum site is empty...
I am trying right now to restore the back up from 12 January (after I have already tried the one from 19 January) .
So I would appreciate very much your help.
the theme is called Zerif PRO
I am using the version 1.4.5 and WP 4.9.2
First of all: Relax.
Then check the Page of the forum, does it have the Shortcode (check in TEXT mode) ?
If yes, then enable Wordpress DEBUG to a LOG and check for FATAL (serious) errors.
Because from what captures you posted, the forum is there (i mean in the db etc etc).