SharePoint Error "An error has occurred in the claim providers configured for this site collection" - Easy fix!

Well, easy if you’re not using nor have configured Claims Based Authentication. If you’re not using Claims Based Authentication and you get the message “An error has occurred in the claim providers configured for this site collection.”, make sure your alternate access mappings are configured correctly. For example, if the Central Administration is at http://sharepoint:8080/, but you’re using the FQDN (http://sharepoint.domain.local:8080/), you may run into this error when attempting to resolve user’s name via the People Picker. Simply add the appropriate alternate access mapping to prevent this error from occurring.

Trevor Seward is a Microsoft Office Apps and Services MVP who specializes in SharePoint Server administration, hybrid scenarios, and SharePoint Online. He has been working with SharePoint for 16 years from SharePoint 2003 on up, managing environments with terabytes of content for 150,000+ user organizations. Trevor is an author of Deploying SharePoint 2016 and Deploying SharePoint 2019. You can find him on Twitter and in /r/sharepoint.