After updating matomo to 4.8.0 I am getting errors

After updating matomo from 3.6.1 to 4.8.0 I am getting errors:

WARNING: /vendor/composer/ClassLoader.php(571): Warning - include(/vendor/composer/…/…/plugins/ExamplePlugin/Archiver.php): failed to open stream: No such file or directory - Matomo 4.8.0 - Please report this message in the Matomo forums: https://forum.matomo.org (please do a search first as it might have been reported already) (Module: UserId, Action: getUsers, Method: UserId.getUsers, In CLI mode: false)

WARNING: /vendor/composer/ClassLoader.php(571): Warning - include(): Failed opening ‘/vendor/composer/…/…/plugins/ExamplePlugin/Archiver.php’ for inclusion (include_path=’/vendor/pear/pear_exception:/vendor/pear/console_getopt:/vendor/pear/pear-core-minimal/src:/vendor/pear/archive_tar:…/lib/php:/home/vcap/app/lib’) - Matomo 4.8.0 - Please report this message in the Matomo forums: https://forum.matomo.org (please do a search first as it might have been reported already) (Module: UserId, Action: getUsers, Method: UserId.getUsers, In CLI mode: false)

What does it means? I also see users analytics data but i couldn’t see mine. Before it happened because I had Ad blocker on chrome, but I couldn’t understand why it happened again. Are these errors could be the reason?

Hi,

Maybe the upgrade got interrupted before it could replace all files. Can you try replacing the files with the latest version from https://matomo.org/download/ (or https://builds.matomo.org/ if you need a specific version)

Actually this is what I did, When I tried to update it from app, it said that data was migrated, but I should update the app code by myself. I downloaded latest version and added config file from previous one. After that i got these error messages.