No entry or class found for 'login.whitelist.ips'

I updated my piwik to the latest version but after updating i got this. what happened? what can i do?

Hi,

it looks like some files are missing. Can you check if you maybe have a plugins/CoreHome/LoginWhitelist.php file?

As a possible solution I’d recommend you to manually replace all files with the correct one from the latest version:
https://matomo.org/docs/update/#the-manual-three-step-update