NC down_httpd service down

Dear community, I cannot acces my server, when I try to reach my server domain I get at the webpage that is telling Apache 2 is running. The problem started since I tried to install Rstudio. I am new to Linux, raspberry pi and Nextcloud. Nextcloud has been running for 6months without problem, till today. Anyhelp will highly appreciated.I tried all the afoomentioned in the forum but nothing worked so far.
I ve posted it also here were you can find the logs as well (on December) but no answer so far:

Any suggestions?