Issue Issues with Plesk

[Studiowebex]

hI, pls i have two questions...

1. some websites, when i press login button from plesk to enter the site, it says "retrieving username & password" but i must manually login. Whu this happened? is something i can fix?
2. In one website i receive the below error, it has to do with the website or theme? Which cache failed to reset?

Thanks