xWIKI Dashboard Time-out

Hello.

Help me please. I’m quite new to the xwiki.
We recently had a problem with our xWiki.

2 links

https://xwiki.ourcompany.ru/bin/view/Projects/
https://xwiki.ourcompany.ru/bin/view/Dashboard/

stopped working. When you click on them there is a hang for 1-2 minutes and then the page opens:

“504 504 Gateway Time-out”

The message “GET / bin / view / Dashboard / HTTP / 1.1” 500 appears in the system log

This a problem only with these 2 links. Other links in xwiki open normally.
I tried to restart tomcat, but after restarting the problem remained.
Tell me why it could be? How can I fix it?