Articles problem on upgrade to 3.0.4

Error log is filling up in MODX3.0.4 (phph8.1) with the message below. I’ve upgraded from MODX2.8.6. On upgrading all Articles had disappeared (front end and back end) and the only way I could get them back was to change each class_key to Articles\Model\Articles. Everything seems to be working ok but I’m worried that these errors are piling up quickly…

[2024-02-01 19:24:43] (ERROR @ /var/www/vhosts/sitedotcodotuk/httpdocs/core/vendor/xpdo/xpdo/src/xPDO/xPDO.php : 473) Path specified for package articles is not a valid or accessible directory: /var/www/vhosts/sitedotcodot/httpdocs/core/components/articles/model/