The requested URL not found

I changed destination of my forum from "public_html/" to "public_html/forum" and now when I try to enter to any discussion or my dashboard I get this error:
The requested URL /index.php was not found on this server.
Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.
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Try to search before you ask: vanillaforums.org/discussion/28567/move-from-one-folder-to-another
Thank you and sorry
Everything's fine, no need for excuses