List operation root item wasn't found
While preparing a new environment, we started having the following error in the logs:
ERROR [ListManager]: List operation root item wasn't found
It turns out one of our colleagues while following my blog post XConnect IndexWorker error “Tokens are incompatible, they have different set of shards.” accidentally removed the folder /sitecore/system/List Manager/ListOperations.
If you run into the same issue and see this folder no longer exists, simply restore it from a vanilla Sitecore installation by generating a package using Sitecore Package Designer and installing it in the broken instance through the Sitecore Package Installer.